Internet Assigned Numbers Authority Precondition Types Used with Session Initiation Protocol (SIP) Created 2002-08-21 Last Updated 2010-07-07 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below * Precondition Types Used with SIP Precondition Types Used with SIP Registration Procedure(s) Standards Action Reference [RFC4032][RFC3312] Note This table describes precondition types used with "Integration of Resource Management with SIP" [RFC3312]. These types appear in the SDP to indicate a constraint that is to be satisfied before the session can proceed. Available Formats [IMG] CSV Precondition-Type Description Reference conn Connectivity precondition [RFC5898] qos Quality of Service preconditions [RFC3312] sec Security precondition [RFC5027] Licensing Terms