Session Initiation Protocol (SIP) Parameters

Created
2002-01
Last Updated
2014-07-31
Available Formats

XML

HTML

Plain text

Registries included below

Header Fields

Expert(s)
Adam Roach
Reference
[RFC3261][RFC3427][RFC5727]
Note
The table below lists the header fields currently defined for the
Session Initiation Protocol (SIP) [RFC3261]. Some headers have
single-letter compact forms (Section 7.3 of RFC 3261). Header field
names are case-insensitive.

Standard header fields and messages MUST NOT begin with the leading
characters "P-".  Existing "P-" header field registrations are
considered grandfathered, but new registrations of Informational
header fields should not begin with the leading characters "P-"
(unless the "P-" would preserve compatibility with an pre-existing
unregistered usage of the header field, at the discretion of the
Designated Expert).  Short forms of header fields MUST only be
assigned to standards track header fields. At the discretion of the 
Designated Expert, a header registration may require a Standards 
Action.
    
Available Formats

CSV
Range Registration Procedures
Informational Header Expert Review
Standard Header Standards Action
Header Name compact Reference
Accept [RFC3261]
Accept-Contact a [RFC3841]
Accept-Encoding [RFC3261]
Accept-Language [RFC3261]
Accept-Resource-Priority [RFC4412]
Alert-Info [RFC3261]
Allow [RFC3261]
Allow-Events u [RFC6665]
Answer-Mode [RFC5373]
Authentication-Info [RFC3261]
Authorization [RFC3261]
Call-ID i [RFC3261]
Call-Info [RFC3261]
Contact m [RFC3261]
Content-Disposition [RFC3261]
Content-Encoding e [RFC3261]
Content-Language [RFC3261]
Content-Length l [RFC3261]
Content-Type c [RFC3261]
CSeq [RFC3261]
Date [RFC3261]
Encryption (Deprecated) [RFC3261]
Error-Info [RFC3261]
Event o [RFC6665][RFC6446]
Expires [RFC3261]
Feature-Caps [RFC6809]
Flow-Timer [RFC5626]
From f [RFC3261]
Geolocation [RFC6442]
Geolocation-Error [RFC6442]
Geolocation-Routing [RFC6442]
Hide (Deprecated) [RFC3261]
History-Info [RFC7044]
Identity y [RFC4474]
Identity-Info n [RFC4474]
Info-Package [RFC6086]
In-Reply-To [RFC3261]
Join [RFC3911]
Max-Breadth [RFC5393]
Max-Forwards [RFC3261]
MIME-Version [RFC3261]
Min-Expires [RFC3261]
Min-SE [RFC4028]
Organization [RFC3261]
P-Access-Network-Info [RFC7315]
P-Answer-State [RFC4964]
P-Asserted-Identity [RFC3325]
P-Asserted-Service [RFC6050]
P-Associated-URI [RFC7315]
P-Called-Party-ID [RFC7315]
P-Charging-Function-Addresses [RFC7315]
P-Charging-Vector [RFC7315]
P-DCS-Trace-Party-ID [RFC5503]
P-DCS-OSPS [RFC5503]
P-DCS-Billing-Info [RFC5503]
P-DCS-LAES [RFC5503]
P-DCS-Redirect [RFC5503]
P-Early-Media [RFC5009]
P-Media-Authorization [RFC3313]
P-Preferred-Identity [RFC3325]
P-Preferred-Service [RFC6050]
P-Private-Network-Indication [RFC7316]
P-Profile-Key [RFC5002]
P-Refused-URI-List [RFC5318]
P-Served-User [RFC5502]
P-User-Database [RFC4457]
P-Visited-Network-ID [RFC7315]
Path [RFC3327]
Permission-Missing [RFC5360]
Policy-Contact [RFC6794]
Policy-ID [RFC6794]
Priority [RFC3261]
Priv-Answer-Mode [RFC5373]
Privacy [RFC3323]
Proxy-Authenticate [RFC3261]
Proxy-Authorization [RFC3261]
Proxy-Require [RFC3261]
RAck [RFC3262]
Reason [RFC3326]
Reason-Phrase Reserved to avoid conflict with [RFC6873]. [Adam_Roach]
Record-Route [RFC3261]
Recv-Info [RFC6086]
Refer-Sub [RFC4488]
Refer-To r [RFC3515]
Referred-By b [RFC3892]
Reject-Contact j [RFC3841]
Replaces [RFC3891]
Reply-To [RFC3261]
Request-Disposition d [RFC3841]
Require [RFC3261]
Resource-Priority [RFC4412]
Response-Key (Deprecated) [RFC3261]
Retry-After [RFC3261]
Route [RFC3261]
RSeq [RFC3262]
Security-Client [RFC3329]
Security-Server [RFC3329]
Security-Verify [RFC3329]
Server [RFC3261]
Service-Route [RFC3608]
Session-Expires x [RFC4028]
Session-ID [RFC-kaplan-insipid-session-id-04]
SIP-ETag [RFC3903]
SIP-If-Match [RFC3903]
Subject s [RFC3261]
Subscription-State [RFC6665]
Supported k [RFC3261]
Suppress-If-Match [RFC5839]
Target-Dialog [RFC4538]
Timestamp [RFC3261]
To t [RFC3261]
Trigger-Consent [RFC5360]
Unsupported [RFC3261]
User-Agent [RFC3261]
User-to-User [RFC-ietf-cuss-sip-uui-17]
Via v [RFC3261][RFC7118]
Warning [RFC3261]
WWW-Authenticate [RFC3261]

Reason Protocols

Registration Procedure(s)
Specification Required
Reference
[RFC3326]
Available Formats

CSV
Protocol value Protocol Cause Reference
SIP Status code [RFC3261]
Q.850 Cause value in decimal representation [ITU-T Q.850]
Preemption Cause value in decimal[1] [RFC4411]

Option Tags

Registration Procedure(s)
Standards Action
Reference
[RFC3261][RFC5727]
Note
Option tags are used in header fields such as Require,
  Supported, Proxy-Require, and Unsupported in support of
  SIP compatibility mechanisms for extensions. The option
  tag itself is a string that is associated with a particular
  SIP option (that is, an extension).
  It identifies the option to SIP endpoints.
Available Formats

CSV
Name Description Reference
100rel This option tag is for reliability of provisional responses. When present in a Supported header, it indicates that the UA can send or receive reliable provisional responses. When present in a Require header in a request it indicates that the UAS MUST send all provisional responses reliably. When present in a Require header in a reliable provisional response, it indicates that the response is to be sent reliably. [RFC3262]
199 This option-tag is for indicating support of the 199 Early Dialog Terminated provisional response code. When present in a Supported header of a request, it indicates that the UAC supports the 199 response code. When present in a Require or Proxy-Require header field of a request, it indicates that the UAS, or proxies, MUST support the 199 response code. It does not require the UAS, or proxies, to actually send 199 responses. [RFC6228]
answermode This option tag is for support of the Answer-Mode and Priv-Answer-Mode extensions used to negotiate automatic or manual answering of a request. [RFC5373]
early-session A UA adding the early-session option tag to a message indicates that it understands the early-session content disposition. [RFC3959]
eventlist Extension to allow subscriptions to lists of resources [RFC4662]
from-change This option tag is used to indicate that a UA supports changes to URIs in From and To header fields during a dialog. [RFC4916]
geolocation-http The "geolocation-http" option tag signals support for acquiring location information via an HTTP [RFC2616]. A location recipient who supports this option can request location with an HTTP GET and parse a resulting 200 response containing a PIDF-LO object. The URI schemes supported by this option include "http" and "https". [RFC6442]
geolocation-sip The "geolocation-sip" option tag signals support for acquiring location information via the presence event package of SIP [RFC3856]. A location recipient who supports this option can send a SUBSCRIBE request and parse a resulting NOTIFY containing a PIDF-LO object. The URI schemes supported by this option include "sip", "sips", and "pres". [RFC6442]
gin This option tag is used to identify the extension that provides Registration for Multiple Phone Numbers in SIP. When present in a Require or Proxy-Require header field of a REGISTER request, it indicates that support for this extension is required of registrars and proxies, respectively, that are a party to the registration transaction. [RFC6140]
gruu This option tag is used to identify the Globally Routable User Agent URI (GRUU) extension. When used in a Supported header, it indicates that a User Agent understands the extension. When used in a Require header field of a REGISTER request, it indicates that the registrar is not expected to process the registration unless it supports the GRUU extension. [RFC5627]
histinfo When used with the Supported header field, this option tag indicates the UAC supports the History Information to be captured for requests and returned in subsequent responses. This tag is not used in a Proxy-Require or Require header field, since support of History-Info is optional. [RFC7044]
ice This option tag is used to identify the Interactive Connectivity Establishment (ICE) extension. When present in a Require header field, it indicates that ICE is required by an agent. [RFC5768]
join Support for the SIP Join Header [RFC3911]
multiple-refer This option tag indicates support for REFER requests that contain a resource list document describing multiple REFER targets. [RFC5368]
norefersub This option tag specifies a User Agent ability of accepting a REFER request without establishing an implicit subscription (compared to the default case defined in [RFC3515]. [RFC4488]
outbound This option-tag is used to identify UAs and Registrars which support extensions for Client Initiated Connections. A UA places this option in a Supported header to communicate its support for this extension. A Registrar places this option-tag in a Require header to indicate to the registering User Agent that the Registrar used registrations using the binding rules defined in this extension. [RFC5626]
path A SIP UA that supports the Path extension header field includes this option tag as a header field value in a Supported header field in all requests generated by that UA. Intermediate proxies may use the presence of this option tag in a REGISTER request to determine whether to offer Path service for for that request. If an intermediate proxy requires that the registrar support Path for a request, then it includes this option tag as a header field value in a Requires header field in that request. [RFC3327]
policy This option tag is used to indicate that a UA can process policy server URIs for and subscribe to session-specific policies. [RFC6794]
precondition An offerer MUST include this tag in the Require header field if the offer contains one or more "mandatory" strength-tags. If all the strength-tags in the description are "optional" or "none" the offerer MUST include this tag either in a Supported header field or in a Require header field. [RFC3312]
pref This option tag is used to ensure that a server understands the callee capabilities parameters used in the request. [RFC3840]
privacy This option tag indicates support for the Privacy mechanism. When used in the Proxy-Require header, it indicates that proxy servers do not forward the request unless they can provide the requested privacy service. This tag is not used in the Require or Supported headers. Proxies remove this option tag before forwarding the request if the desired privacy function has been performed. [RFC3323]
recipient-list-invite The body contains a list of URIs that indicates the recipients of the SIP INVITE request [RFC5366]
recipient-list-message The body contains a list of URIs that indicates the recipients of the SIP MESSAGE request [RFC5365]
recipient-list-subscribe This option tag is used to ensure that a server can process the recipient-list body used in a SUBSCRIBE request. [RFC5367]
replaces This option tag indicates support for the SIP Replaces header. [RFC3891]
resource-priority Indicates or requests support for the resource priority mechanism. [RFC4412]
sdp-anat The option-tag sdp-anat is defined for use in the Require and Supported SIP [RFC3261] header fields. SIP user agents that place this option-tag in a Supported header field understand the ANAT semantics as defined in [RFC4091]. [RFC4092]
sec-agree This option tag indicates support for the Security Agreement mechanism. When used in the Require, or Proxy-Require headers, it indicates that proxy servers are required to use the Security Agreement mechanism. When used in the Supported header, it indicates that the User Agent Client supports the Security Agreement mechanism. When used in the Require header in the 494 (Security Agreement Required) or 421 (Extension Required) responses, it indicates that the User Agent Client must use the Security Agreement Mechanism. [RFC3329]
tdialog This option tag is used to identify the target dialog header field extension. When used in a Require header field, it implies that the recipient needs to support the Target-Dialog header field. When used in a Supported header field, it implies that the sender of the message supports it. [RFC4538]
timer This option tag is for support of the session timer extension. Inclusion in a Supported header field in a request or response indicates that the UA is capable of performing refreshes according to that specification. Inclusion in a Require header in a request means that the UAS must understand the session timer extension to process the request. Inclusion in a Require header field in a response indicates that the UAC must look for the Session-Expires header field in the response, and process accordingly. [RFC4028]
uui This option tag is used to indicate that a UA supports and understands the User-to-User header field. [RFC-ietf-cuss-sip-uui-17]

Warning Codes (warn-codes)

Reference
[RFC3261][Section 27.2]
Note
Warning codes provide information supplemental to the status code
in SIP response messages.
Available Formats

CSV
Code Description Reference
300 Incompatible network protocol: One or more network protocols contained in the session description are not available. [RFC3261]
301 Incompatible network address formats: One or more network address formats contained in the session description are not available. [RFC3261]
302 Incompatible transport protocol: One or more transport protocols described in the session description are not available. [RFC3261]
303 Incompatible bandwidth units: One or more bandwidth measurement units contained in the session description were not understood. [RFC3261]
304 Media type not available: One or more media types contained in the session description are not available. [RFC3261]
305 Incompatible media format: One or more media formats contained in the session description are not available. [RFC3261]
306 Attribute not understood: One or more of the media attributes in the session description are not supported. [RFC3261]
307 Session description parameter not understood: A parameter other than those listed above was not understood. [RFC3261]
330 Multicast not available: The site where the user is located does not support multicast. [RFC3261]
331 Unicast not available: The site where the user is located does not support unicast communication (usually due to the presence of a firewall). [RFC3261]
370 Insufficient bandwidth: The bandwidth specified in the session description or defined by the media exceeds that known to be available. [RFC3261]
380 SIPS Not Allowed: The UAS or proxy cannot process the request because the SIPS scheme is not allowed (e.g., because there are currently no registered SIPS Contacts). [RFC5630]
381 SIPS Required: The UAS or proxy cannot process the request because the SIPS scheme is required. [RFC5630]
399 Miscellaneous warning: The warning text can include arbitrary information to be presented to a human user or logged. A system receiving this warning MUST NOT take any automated action. [RFC3261]

Methods and Response Codes

Registration Procedure(s)
Standards Action
Reference
[RFC3261][RFC5727]
Available Formats

CSV
Methods Reference
ACK [RFC3261]
BYE [RFC3261]
CANCEL [RFC3261]
INFO [RFC6086]
INVITE [RFC3261][RFC6026]
MESSAGE [RFC3428]
NOTIFY [RFC6665]
OPTIONS [RFC3261]
PRACK [RFC3262]
PUBLISH [RFC3903]
REFER [RFC3515]
REGISTER [RFC3261]
SUBSCRIBE [RFC6665]
UPDATE [RFC3311]

Response Codes

Note
All response codes below are defined by [RFC3261] unless
otherwise noted.
Available Formats

CSV
Response Code Description Reference
1xx Provisional
100 Trying
180 Ringing
181 Call Is Being Forwarded
182 Queued
183 Session Progress
199 Early Dialog Terminated [RFC6228]
2xx Successful
200 OK
202 Accepted (Deprecated) [RFC6665]
204 No Notification [RFC5839]
3xx Redirection
300 Multiple Choices
301 Moved Permanently
302 Moved Temporarily
305 Use Proxy
380 Alternative Service
4xx Request Failure
400 Bad Request
401 Unauthorized
402 Payment Required
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable
407 Proxy Authentication Required
408 Request Timeout
410 Gone
412 Conditional Request Failed [RFC3903]
413 Request Entity Too Large
414 Request-URI Too Long
415 Unsupported Media Type
416 Unsupported URI Scheme
417 Unknown Resource-Priority [RFC4412]
420 Bad Extension
421 Extension Required
422 Session Interval Too Small [RFC4028]
423 Interval Too Brief
424 Bad Location Information [RFC6442]
428 Use Identity Header [RFC4474]
429 Provide Referrer Identity [RFC3892]
430 Flow Failed [RFC5626]
433 Anonymity Disallowed [RFC5079]
436 Bad Identity-Info [RFC4474]
437 Unsupported Certificate [RFC4474]
438 Invalid Identity Header [RFC4474]
439 First Hop Lacks Outbound Support [RFC5626]
440 Max-Breadth Exceeded [RFC5393]
469 Bad Info Package [RFC6086]
470 Consent Needed [RFC5360]
480 Temporarily Unavailable
481 Call/Transaction Does Not Exist
482 Loop Detected
483 Too Many Hops
484 Address Incomplete
485 Ambiguous
486 Busy Here
487 Request Terminated
488 Not Acceptable Here
489 Bad Event [RFC6665]
491 Request Pending
493 Undecipherable
494 Security Agreement Required [RFC3329]
5xx Server Failure
500 Server Internal Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Server Time-out
505 Version Not Supported
513 Message Too Large
580 Precondition Failure [RFC3312]
6xx Global Failures
600 Busy Everywhere
603 Decline
604 Does Not Exist Anywhere
606 Not Acceptable

SIP Privacy Header Field Values

Registration Procedure(s)
IETF Review
Reference
[RFC3323]
Available Formats

CSV
Privacy Type Description Registrant Reference
user Request that privacy services provide a user-level privacy function [Jon_Peterson] [RFC3323]
header Request that privacy services modify headers that cannot be set arbitrarily by the user (Contact/Via). [Jon_Peterson] [RFC3323]
session Request that privacy services provide privacy for session media [Jon_Peterson] [RFC3323]
none Privacy services must not perform any privacy function [Jon_Peterson] [RFC3323]
critical Privacy service must perform the specified services or fail the request [Jon_Peterson] [RFC3323]
id Privacy requsted for Third-Party Asserted Identity [Cullen_Jennings] [RFC3325]
history Privacy requested for History-Info header field(s) [Mary_Barnes] [RFC7044]

Security Mechanism Names

Reference
[RFC3329 Section 6]
Available Formats

CSV
Mechanism Name Reference
digest [RFC3329]
tls [RFC3329]
ipsec-ike [RFC3329]
ipsec-man [RFC3329]
ipsec-3gpp [RFC3329]

Compression Schemes

Reference
[RFC3486 Section 11]
Available Formats

CSV
Compression Scheme Token Reference
Signaling Compression sigcomp [RFC3486]

SIP/SIPS URI Parameters

Registration Procedure(s)
Standards Action
Reference
[RFC3969][RFC5727]
Available Formats

CSV
Parameter Name Predefined Values Reference
aai No [RFC5552]
bnc No [RFC6140]
cause Yes [RFC4458]
ccxml No [RFC5552]
comp Yes [RFC3486]
content-type No [RFC4240]
delay No [RFC4240]
duration No [RFC4240]
extension No [RFC4240]
gr No [RFC5627]
locale No [RFC4240]
lr No [RFC3261]
m Yes [RFC6910]
maddr No [RFC3261]
maxage No [RFC5552]
maxstale No [RFC5552]
method "get" / "post" [RFC5552]
method Yes [RFC3261]
ob No [RFC5626]
param[n] No [RFC4240]
play No [RFC4240]
postbody No [RFC5552]
repeat No [RFC4240]
sg No [RFC6140]
sigcomp-id No [RFC5049]
target No [RFC4458]
transport Yes [RFC3261][RFC7118]
ttl No [RFC3261]
user Yes [RFC3261][RFC4967]
voicexml No [RFC4240]

Header Field Parameters and Parameter Values

Registration Procedure(s)
Published RFC (A standards-track RFC is NOT required)
Reference
[RFC3968]
Available Formats

CSV
Header Field Parameter Name Predefined Values Reference
Accept q No [RFC3261]
Accept-Encoding q No [RFC3261]
Accept-Language q No [RFC3261]
Alert-Info appearance No [RFC-ietf-bliss-shared-appearances-15]
Answer-Mode require No [RFC5373]
Authorization algorithm Yes [RFC3261][RFC3310]
Authorization auts No [RFC3310]
Authorization cnonce No [RFC3261]
Authorization nc No [RFC3261]
Authorization nonce No [RFC3261]
Authorization opaque No [RFC3261]
Authorization qop Yes [RFC3261]
Authorization realm No [RFC3261]
Authorization response No [RFC3261]
Authorization uri No [RFC3261]
Authorization username No [RFC3261]
Authentication-Info cnonce No [RFC3261]
Authentication-Info nc No [RFC3261]
Authentication-Info nextnonce No [RFC3261]
Authentication-Info qop Yes [RFC3261]
Authentication-Info rspauth No [RFC3261]
Call-Info m Yes [RFC6910]
Call-Info purpose Yes [RFC3261][RFC5367][RFC6910][RFC6993][RFC7082]
Contact expires No [RFC3261]
Contact mp No [RFC7044]
Contact np No [RFC7044]
Contact pub-gruu No [RFC5627]
Contact q No [RFC3261]
Contact rc No [RFC7044]
Contact reg-id No [RFC5626]
Contact temp-gruu No [RFC5627]
Contact temp-gruu-cookie No [RFC6140]
Content-Disposition handling Yes [RFC3204][RFC3261][RFC3459][RFC-ietf-sip-body-handling-06]
Event adaptive-min-rate No [RFC6446]
Event body Yes [RFC5989]
Event call-id No [RFC4235]
Event effective-by No [RFC6080]
Event from-tag No [RFC4235]
Event id No [RFC6665]
Event include-session-description No [RFC4235]
Event max-rate No [RFC6446]
Event min-rate No [RFC6446]
Event model No [RFC6080]
Event profile-type Yes [RFC6080]
Event shared No [RFC-ietf-bliss-shared-appearances-15]
Event to-tag No [RFC4235]
Event vendor No [RFC6080]
Event version No [RFC6080]
Feature-Caps fcap-name [2] No [RFC6809]
From tag No [RFC3261]
Geolocation-Error code Yes [RFC6442]
History-Info mp No [RFC7044]
History-Info np No [RFC7044]
History-Info rc No [RFC7044]
P-Access-Network-Info cgi-3gpp No [RFC7315]
P-Access-Network-Info ci-3gpp2 No [RFC7315]
P-Access-Network-Info ci-3gpp2-femto No [RFC7315]
P-Access-Network-Info dsl-location No [RFC7315]
P-Access-Network-Info dvb-rcs2-node-id No [RFC7315]
P-Access-Network-Info eth-location No [RFC7315]
P-Access-Network-Info fiber-location No [RFC7315]
P-Access-Network-Info gstn-location No [RFC7315]
P-Access-Network-Info i-wlan-node-id No [RFC7315]
P-Access-Network-Info local-time-zone No [RFC7315]
P-Access-Network-Info operator-specific-GI No [RFC7315]
P-Access-Network-Info utran-cell-id-3gpp No [RFC7315]
P-Access-Network-Info utran-sai-3gpp No [RFC7315]
P-Charging-Function-Addresses ccf No [RFC7315]
P-Charging-Function-Addresses ccf-2 No [RFC7315]
P-Charging-Function-Addresses ecf No [RFC7315]
P-Charging-Function-Addresses ecf-2 No [RFC7315]
P-Charging-Vector icid-value No [RFC7315]
P-Charging-Vector icid-generated-at No [RFC7315]
P-Charging-Vector orig-ioi No [RFC7315]
P-Charging-Vector related-icid No [RFC7315]
P-Charging-Vector related-icid-generated-at No [RFC7315]
P-Charging-Vector term-ioi No [RFC7315]
P-Charging-Vector transit-ioi No [RFC7315]
P-DCS-Billing-Info called No [RFC5503]
P-DCS-Billing-Info calling No [RFC5503]
P-DCS-Billing-Info charge No [RFC5503]
P-DCS-Billing-Info jip No [RFC5503]
P-DCS-Billing-Info locroute No [RFC5503]
P-DCS-Billing-Info rksgroup No [RFC5503]
P-DCS-Billing-Info routing No [RFC5503]
P-DCS-LAES bcid No [RFC5503]
P-DCS-LAES cccid No [RFC5503]
P-DCS-LAES content No [RFC5503]
P-DCS-LAES key (OBSOLETED) No [RFC3603][RFC5503]
P-DCS-Redirect count No [RFC5503]
P-DCS-Redirect redirector-uri No [RFC5503]
P-DCS-Trace-Party-ID timestamp No [RFC5503]
P-Refused-URI-List members No [RFC5318]
Policy-Contact non-cacheable Yes [RFC6794]
Priv-Answer-Mode require No [RFC5373]
Proxy-Authenticate algorithm Yes [RFC3261][RFC3310]
Proxy-Authenticate domain No [RFC3261]
Proxy-Authenticate nonce No [RFC3261]
Proxy-Authenticate opaque No [RFC3261]
Proxy-Authenticate qop Yes [RFC3261]
Proxy-Authenticate realm No [RFC3261]
Proxy-Authenticate stale Yes [RFC3261]
Proxy-Authorization algorithm Yes [RFC3261][RFC3310]
Proxy-Authorization auts No [RFC3310]
Proxy-Authorization cnonce No [RFC3261]
Proxy-Authorization nc No [RFC3261]
Proxy-Authorization nonce No [RFC3261]
Proxy-Authorization opaque No [RFC3261]
Proxy-Authorization qop Yes [RFC3261]
Proxy-Authorization realm No [RFC3261]
Proxy-Authorization response No [RFC3261]
Proxy-Authorization uri No [RFC3261]
Proxy-Authorization username No [RFC3261]
Reason cause Yes [RFC3326]
Reason text No [RFC3326]
Retry-After duration No [RFC3261]
Security-Client alg Yes [RFC3329]
Security-Client ealg Yes [RFC3329]
Security-Client d-alg Yes [RFC3329]
Security-Client d-qop Yes [RFC3329]
Security-Client d-ver No [RFC3329]
Security-Client mod Yes [RFC3329]
Security-Client port1 No [RFC3329]
Security-Client port2 No [RFC3329]
Security-Client prot Yes [RFC3329]
Security-Client q No [RFC3329]
Security-Client spi No [RFC3329]
Security-Server alg Yes [RFC3329]
Security-Server ealg Yes [RFC3329]
Security-Server d-alg Yes [RFC3329]
Security-Server d-qop Yes [RFC3329]
Security-Server d-ver No [RFC3329]
Security-Server mod Yes [RFC3329]
Security-Server port1 No [RFC3329]
Security-Server port2 No [RFC3329]
Security-Server prot Yes [RFC3329]
Security-Server q No [RFC3329]
Security-Server spi No [RFC3329]
Security-Verify alg Yes [RFC3329]
Security-Verify ealg Yes [RFC3329]
Security-Verify d-alg Yes [RFC3329]
Security-Verify d-qop Yes [RFC3329]
Security-Verify d-ver No [RFC3329]
Security-Verify mod Yes [RFC3329]
Security-Verify port1 No [RFC3329]
Security-Verify port2 No [RFC3329]
Security-Verify prot Yes [RFC3329]
Security-Verify q No [RFC3329]
Security-Verify spi No [RFC3329]
Subscription-State adaptive-min-rate No [RFC6446]
Subscription-State expires No [RFC6665]
Subscription-State max-rate No [RFC6446]
Subscription-State min-rate No [RFC6446]
Subscription-State reason Yes [RFC6665]
Subscription-State retry-after No [RFC6665]
Target-Dialog local-tag No [RFC4538]
Target-Dialog remote-tag No [RFC4538]
To tag No [RFC3261]
Trigger-Consent target-uri No [RFC5360]
User-to-User content No [RFC-ietf-cuss-sip-uui-17]
User-to-User encoding Yes [RFC-ietf-cuss-sip-uui-17]
User-to-User purpose No [RFC-ietf-cuss-sip-uui-17]
Via alias No [RFC5923]
Via branch No [RFC3261]
Via comp Yes [RFC3486]
Via keep No [RFC6223]
Via maddr No [RFC3261]
Via oc Yes [RFC-ietf-soc-overload-control-15]
Via oc-algo Yes [RFC-ietf-soc-overload-control-15]
Via oc-seq Yes [RFC-ietf-soc-overload-control-15]
Via oc-validity Yes [RFC-ietf-soc-overload-control-15]
Via received No [RFC3261][RFC7118]
Via rport No [RFC3581]
Via sigcomp-id No [RFC5049]
Via ttl No [RFC3261]
WWW-Authenticate algorithm Yes [RFC3261][RFC3310]
WWW-Authenticate domain Yes [RFC3261]
WWW-Authenticate nonce No [RFC3261]
WWW-Authenticate opaque No [RFC3261]
WWW-Authenticate qop Yes [RFC3261]
WWW-Authenticate realm No [RFC3261]
WWW-Authenticate stale Yes [RFC3261]

URI Purposes

Registration Procedure(s)
Specification Required
Reference
[RFC4575]
Available Formats

CSV
Value Description Reference
participation The URI can be used to join the conference [RFC4575]
streaming The URI can be used to access the streamed conference data [RFC4575]
event The URI can be used to subscribe to the conference event package [RFC4575]
recording The URI can be used to access the recorded conference data [RFC4575]
web-page The URI can be used to access a web page that contains additional information of the conference [RFC4575]
ccmp The URI can be used to indicate that the conference focus supports CCMP. [RFC7082]
grouptextchat The URI can be used to join a multi-user chat directly associated with the conference [RFC7106]

Resource-Priority Namespaces

Registration Procedure(s)
IETF Review
Reference
[RFC4412][RFC7134]
Note
Namespace      = the unique string identifying the namespace
Namespace Numerical Value = the unique numerical value identifying the namespace
Levels         = the number of priority-values within the namespace
Algorithm      = Intended operational behavior of SIP elements
                 implementing this namespace
New Warn code  = New Warning Codes (warn-codes) introduced by this namespace
New Resp. code = New SIP response codes introduced by this namespace
Reference      = IETF document reference for this namespace
Namespace Numerical Value = [RFC6401]
Available Formats

CSV
Namespace Namespace Numerical Value Levels Algorithm Intended Code New warn-code New resp. Reference
dsn 0 5 preemption no no [RFC4412]
drsn 1 6 preemption no no [RFC4412]
q735 2 5 preemption no no [RFC4412]
ets 3 5 queue no no [RFC4412]
wps 4 5 queue no no [RFC4412]
dsn-000000 5 10 preemption no no [RFC5478]
dsn-000001 6 10 preemption no no [RFC5478]
dsn-000002 7 10 preemption no no [RFC5478]
dsn-000003 8 10 preemption no no [RFC5478]
dsn-000004 9 10 preemption no no [RFC5478]
dsn-000005 10 10 preemption no no [RFC5478]
dsn-000006 11 10 preemption no no [RFC5478]
dsn-000007 12 10 preemption no no [RFC5478]
dsn-000008 13 10 preemption no no [RFC5478]
dsn-000009 14 10 preemption no no [RFC5478]
drsn-000000 15 10 preemption no no [RFC5478]
drsn-000001 16 10 preemption no no [RFC5478]
drsn-000002 17 10 preemption no no [RFC5478]
drsn-000003 18 10 preemption no no [RFC5478]
drsn-000004 19 10 preemption no no [RFC5478]
drsn-000005 20 10 preemption no no [RFC5478]
drsn-000006 21 10 preemption no no [RFC5478]
drsn-000007 22 10 preemption no no [RFC5478]
drsn-000008 23 10 preemption no no [RFC5478]
drsn-000009 24 10 preemption no no [RFC5478]
rts-000000 25 10 preemption no no [RFC5478]
rts-000001 26 10 preemption no no [RFC5478]
rts-000002 27 10 preemption no no [RFC5478]
rts-000003 28 10 preemption no no [RFC5478]
rts-000004 29 10 preemption no no [RFC5478]
rts-000005 30 10 preemption no no [RFC5478]
rts-000006 31 10 preemption no no [RFC5478]
rts-000007 32 10 preemption no no [RFC5478]
rts-000008 33 10 preemption no no [RFC5478]
rts-000009 34 10 preemption no no [RFC5478]
crts-000000 35 10 preemption no no [RFC5478]
crts-000001 36 10 preemption no no [RFC5478]
crts-000002 37 10 preemption no no [RFC5478]
crts-000003 38 10 preemption no no [RFC5478]
crts-000004 39 10 preemption no no [RFC5478]
crts-000005 40 10 preemption no no [RFC5478]
crts-000006 41 10 preemption no no [RFC5478]
crts-000007 42 10 preemption no no [RFC5478]
crts-000008 43 10 preemption no no [RFC5478]
crts-000009 44 10 preemption no no [RFC5478]
esnet 45 5 queue no no [RFC7135]

Resource-Priority Priority-values

Registration Procedure(s)
IETF Review
Reference
[RFC4412][RFC7134]
Note
Legend:
Namespace Numerical Value = the unique numerical value identifying the namespace
Priority Numerical Value: [RFC6401]

Namespace: drsn

Reference
[RFC4412]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"routine" 5
"priority" 4
"immediate" 3
"flash" 2
"flash-override" 1
"flash-override-override" 0

Namespace: dsn

Reference
[RFC4412]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"routine" 4
"priority" 3
"immediate" 2
"flash" 1
"flash-override" 0

Namespace: q735

Reference
[RFC4412]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"4" 4
"3" 3
"2" 2
"1" 1
"0" 0

Namespace: ets

Reference
[RFC4412]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"4" 4
"3" 3
"2" 2
"1" 1
"0" 0

Namespace: wps

Reference
[RFC4412]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"4" 4
"3" 3
"2" 2
"1" 1
"0" 0

Namespace: dsn-000000

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000001

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000002

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000003

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000004

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000005

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000006

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000007

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000008

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: dsn-000009

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000000

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000001

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000002

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000003

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000004

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000005

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000006

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000007

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000008

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: drsn-000009

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000000

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000001

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000002

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000003

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000004

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000005

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000006

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000007

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000008

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: rts-000009

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000000

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000001

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000002

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000003

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000004

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000005

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000006

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000007

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000008

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: crts-000009

Reference
[RFC5478]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 9
"1" 8
"2" 7
"3" 6
"4" 5
"5" 4
"6" 3
"7" 2
"8" 1
"9" 0

Namespace: esnet

Reference
[RFC7135]
Available Formats

CSV
Priority-Values (least to greatest) Priority Numerical Value
"0" 4
"1" 3
"2" 2
"3" 1
"4" 0

Identity-Info Parameters

Registration Procedure(s)
Standards Track RFC
Reference
[RFC4474]
Available Formats

CSV
Parameter Name Reference
alg [RFC4474]

Identity-Info Algorithm Parameter Values

Registration Procedure(s)
Standards Track RFC
Reference
[RFC4474]
Available Formats

CSV
'alg' Parameter Name Reference
rsa-sha1 [RFC4474]
rsa-sha256 [RFC6072]

SIP Forum User Agent Configuration Parameters

Reference
[RFC6011]
Available Formats

CSV
Range Registration Procedures
begins with 'sfua-' RFC Required
all other names First Come First Served
Parameter Name Description Reference
sfua-id The URN identifying the User Agent, constructed as specified in section 4.1 of [RFC5626] "Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)". Since the procedure defined by [RFC5626] allows any UA to construct a value for this parameter, the sfua-id parameter MUST always be included. If the UA implements [RFC5626], and includes the '+sip.instance' Contact header field parameter in any request, when requesting configuration it MUST use the same value for the sfua-id parameter. [RFC6011]
sfua-user An identifier for a user associated with the configuration. Note that this might be different than any SIP 'user' in the UA configuration: it could, for example, be the login name of an account on the service provider web site. The syntax of this parameter is that of the [RFC2617] 'userid'. See Section 2.4.1, "Configuration Data Request Authentication" for how this parameter relates to authentication of the configuration data request. [RFC6011]
sfua-vendor An identifier that specifies the vendor of the User Agent. The syntax of the value of this parameter is that of a DNS domain. The domain value MUST be that of a domain owned by the vendor. [RFC6011]
sfua-model An identifier that further specifies the User Agent from among those produced by the vendor. The syntax of the value of this parameter is the same as the [RFC3261] 'token'. Values for this parameter are selected by the vendor.
sfua-revision An identifier that further specifies the User Agent from among those produced by the vendor. The syntax of the value of this parameter is the same as the [RFC3261] 'token'. Values for this parameter are selected by the vendor. [RFC6011]

Service-ID/Application-ID Labels

Registration Procedure(s)
Specification Required
Reference
[RFC6050]
Available Formats

CSV
Service/Application Description Reference
3gpp-service Communication services defined by 3GPP for use by the IM CN subsystem and its attached UAs. This value in itself does not define a service and requires subsequent labels to define the service. [RFC6050]
3gpp-application Applications defined by 3GPP for use by UAs attached to the IM CN subsystem. This value in itself does not define a service and requires subsequent labels to define the service. [RFC6050]

Info Packages Registry

Registration Procedure(s)
Specification Required
Expert(s)
Adam Roach
Reference
[RFC6086]
Name Reference
No registrations at this time.

SIP Configuration Profile Types

Registration Procedure(s)
Specification Required
Reference
[RFC6080]
Available Formats

CSV
Profile Type Reference
local-network [RFC6080]
device [RFC6080]
user [RFC6080]

Geolocation-Error Codes

Registration Procedure(s)
Specification Required
Reference
[RFC6442]
Available Formats

CSV
Code Default Reason Phrase Reference
100 "Cannot Process Location" [RFC6442]
200 "Permission to Use Location Information" [RFC6442]
201 "Permission to Retransmit Location Information to a Third Party" [RFC6442]
202 "Permission to Route Based on Location Information" [RFC6442]
300 "Deference Failure" [RFC6442]

Reason Codes

Registration Procedure(s)
RFC Required
Reference
[RFC6665]
Available Formats

CSV
Reason Code Reference
deactivated [RFC6665]
probation [RFC6665]
rejected [RFC6665]
timeout [RFC6665]
giveup [RFC6665]
noresource [RFC6665]
invariant [RFC6665]
badfilter [RFC4660]

Proxy-Feature Feature-Capability Indicator Trees

Registration Procedure(s)
Standards Action
Reference
[RFC6809]
Available Formats

CSV
Leading Facet Feature-Capability Indicator Tree Reference
g. Global Feature Capability Indicator Tree [RFC6809]
sip. SIP Feature Capability Indicator Tree [RFC6809]

Global Feature-Capability Indicator Registration Tree

Registration Procedure(s)
Specification Required
Expert(s)
Paul Kyzivat (primary), Christer Holmberg (secondary)
Reference
[RFC6809]
Available Formats

CSV
Name Description Reference
g.3gpp.iut-focus This feature-capability indicator when used in a Feature-Caps header field of a SIP request or a SIP response indicates that the function which inserted the Feature-Caps header field supports anchoring an IUT session. [3GPP TS 24.337 10.7.0]
g.3gpp.mid-call This feature-capability indicator when used in a Feature-Caps header field of a SIP request or a SIP response indicates that: 1. the functional entity including the feature-capability indicator in the SIP message supports the MSC server assisted mid-call feature; and 2. all entities of which the functional entity including the feature-capability indicator in the SIP message is aware of being requested to support the feature do support the MSC server assisted mid-call feature. [3GPP TS 24.237 10.10.0]
g.3gpp.atcf This feature-capability indicator when included in a Feature-Caps header field as specified in IETF RFC 6809 in a SIP REGISTER request or a SIP response to the SIP REGISTER request indicates presence and support of a resource which is an Access Transfer Control Function (ATCF) and also the session transfer number allocated to the ATCF. [3GPP TS 24.237 10.10.0]
g.3gpp.srvcc-alerting This feature-capability indicator when used in a Feature-Caps header field of a SIP request or a SIP response indicates that: 1. the functional entity including the feature-capability indicator in the SIP message supports access transfer for calls in alerting phase; and 2. all entities of which the functional entity including the feature-capability indicator in the SIP message is aware of being requested to support the feature do support access transfer for calls in alerting phase. [3GPP TS 24.237 10.10.0]
g.3gpp.atcf-mgmt-uri This feature-capability indicator when used in a Feature-Caps header field as specified in IETF RFC 6809 [60] in SIP REGISTER request indicates presence and support of performing as a UAS for SIP requests for ATCF management received at this URI. [3GPP TS 24.237 10.10.0]
g.3gpp.srvcc This feature-capability indicator when included in a Feature-Caps header field as specified in IETF RFC 6809 of: - a SIP INVITE request; or - a SIP INVITE response; indicates presence and support of a resource capable of performing the SRVCC access transfer procedure as specified in 3GPP TS 24.237. [3GPP TS 24.237 10.10.0]
g.3gpp.atcf-path This feature-capability indicator when used in a Feature-Caps header field as specified in IETF RFC 6809 in SIP REGISTER request indicates capability of identifying the registration path and binding SRVCC related information to it. [3GPP TS 24.237 10.10.0]
g.3gpp.cs2ps-srvcc This feature-capability indicator when included in Feature-Caps header field as specified in IETF RFC 6809 [60] indicates support of the CS to PS single radio voice call continuity as specified in 3GPP TS 24.237. [Frederic_Firmin][3GPP TS 24.237 11.10.0]
g.3gpp.ti This feature-capability indicator when used in a Feature-Caps header field as specified in IETF RFC 6809 in SIP INVITE request or SIP response to the SIP INVITE request indicates the capability of associating a CS call with dialog created by the SIP INVITE request. [Frederic_Firmin][3GPP TS 24.237 11.10.0]
g.3gpp.loopback This feature-capability indicator, when included in a Feature-Caps header field as specified in RFC 6809 in a SIP INVITE request, indicates the support of the roaming architecture for voice over IMS with local breakout. [Frederic_Firmin][3GPP TS 24.229]
g.3gpp.trf This feature-capability indicator, when included in a Feature-Caps header field as specified in RFC 6809 in a SIP INVITE request, indicates that in a roaming scenario, the visited network supports a transit and roaming functionality in order to allow loopback of session requests to the visited network from the home network. When used, it may indicate the URI of the transit and roaming functionality. [Frederic_Firmin][3GPP TS 24.229 11.11.0]
g.3gpp.home-visited This feature-capability indicator, when included in a Feature-Caps header field as specified in RFC 6809 in a SIP INVITE request, indicates that the home network supports loopback to the identified visited network for this session. The loopback is expected to be applied at some subsequent entity to the insertion point. The feature-capability indicator carries a parameter value which indicates the visited network. [Frederic_Firmin][3GPP TS 24.229]
g.3gpp.mrb This feature-capability indicator when included in a Feature-Caps header field as specified in RFC 6809in a SIP INVITE request indicates that in a roaming scenario, the visited network supports media resource broker functionality for the allocation of multimedia resources in the visited network. When used, it indicates the URI of the visited network MRB. [Frederic_Firmin][3GPP TS 24.229 11.11.0]
g.3gpp.icsi-ref Each value of the Service Reference feature-capability indicator indicates the software applications supported by the entity. The values for this feature-capability indicator equal the IMS communication Service Identifier (ICSI) values supported by the entity. Multiple feature-capability indicator values can be included in the Service Reference feature-capability indicators. When included in the Feature-Caps header field, according to RFC 6809, the value of this feature-capability indicator contains the IMS communication service identifier (ICSI) of the IMS communication service supported for use 1) in the standalone transaction (if included in a request for a standalone transaction or a response associated with it) or 2) in the dialog (if included in an initial request for dialog or a response associated with it) by the entity which included the Feature-Caps header field. [Frederic_Firmin][3GPP TS 24.229 v11.12.0]

SIP Feature-Capability Indicator Registration Tree

Registration Procedure(s)
IETF Review
Reference
[RFC6809]
Name Description Reference
No registrations at this time.

Priority Header Field Values

Registration Procedure(s)
IETF Review
Reference
[RFC6878]
Available Formats

CSV
Reason Code Reference
non-urgent [RFC3261]
normal [RFC3261]
urgent [RFC3261]
emergency [RFC3261]
psap-callback [RFC7090]

SIP Transport

Registration Procedure(s)
Standards Action
Reference
[RFC7118]
Available Formats

CSV
Transport Reference
UDP [RFC3261]
TCP [RFC3261]
TLS [RFC3261]
SCTP [RFC3261][RFC4168]
TLS-SCTP [RFC4168]
WS [RFC7118]
WSS [RFC7118]

UUI Packages

Registration Procedure(s)
Standards Action
Reference
[RFC-ietf-cuss-sip-uui-17]
Note
UUI Packages provides information about the usage of the UUI data in 
a User-to-User header field [RFC-ietf-cuss-sip-uui-17].
    
Package Description Reference
No registrations at this time.

UUI Content Parameters

Registration Procedure(s)
Standards Action
Reference
[RFC-ietf-cuss-sip-uui-17]
Note
UUI Content provides information about the content of the UUI data in 
a User-to-User header field [RFC-ietf-cuss-sip-uui-17].
    
Content Description Reference
No registrations at this time.

UUI Encoding Parameters

Registration Procedure(s)
Standards Action
Reference
[RFC-ietf-cuss-sip-uui-17]
Note
UUI Encoding provides information about the encoding of the UUI data in 
a User-to-User header field [RFC-ietf-cuss-sip-uui-17].
    
Available Formats

CSV
Encoding Description Reference
hex The UUI data is encoded using hexadecimal [RFC-ietf-cuss-sip-uui-17]

People

ID Name Contact URI Last Updated
[Adam_Roach] Adam Roach mailto:adam&nostrum.com 2013-02-26
[Cullen_Jennings] Cullen Jennings mailto:fluffy&cisco.com
[Frederic_Firmin] Frederic Firmin mailto:frederic.firmin&etsi.org 2014-07-02
[Jon_Peterson] Jon Peterson mailto:jon.peterson&neustar.biz
[Mary_Barnes] Mary Barnes mailto:mary.ietf.barnes&gmail.com 2013-06-18

Footnotes

[1]
see the separate "Preemption" Registry for default reason-text strings [IANA registry preemption-namespace]
[2]
<fcap-name> denotes parameter names conforming to the
syntax <fcap-name> defined in [RFC6809]. 
Valid feature-capability indicators are registered in the 
Proxy-Feature Feature-Capability Indicator Trees registry.