Media type name: application Media subtype name: vnd.3gpp.interworking-data Required parameters: none Optional parameters: none Encoding considerations: binary Security considerations: General mechanisms for privacy and integrity protection of protocol parameters exist. Those mechanisms as well as authentication and further security mechanisms are described in 3GPP TS 24.229. Security mechanisms specific to this media type are dependent upon the business and trust relationship between the Interworking function operator, the mission critical services operator and the SIP carrier operator. Mission critical services operators may wish to encrypt and integrity protect the content transported by this media type indepedently of mechanisms provided by the transport layer. Such mechanisms have been specified by 3GPP SA3. The information transported in this media type does not include active or executable content. This media type may include provisions for directives that institute actions on a recipient's files or other resources. This media type does not include provisions for directives that institute actions that, while not directly harmful to the recipient, may result in disclosure of information that either facilitates a subsequent attack or else violates a recipient's privacy in any way. This media type does not employ compression. Interoperability considerations: The content transported within this media type does not need to be interpreted by a server as specific decisions are made based on the signalling content (e.g. store disposition history). The final destination point of the content is the terminating UE. Each UE and server that handles the content transported using this media type shall understand the definition of the messages and protocol elements as defined in 3GPP TS 29.379. Any messages and protocol elements not defined by 3GPP TS 29.379 shall be ignored by the recipient UE or server. Published specification: 3GPP TS 29.379 "Mission Critical Push To Talk (MCPTT) call control interworking with LMR systems; Protocol specification" v16.6.1, available via https://www.3gpp.org/ftp//Specs/archive/29_series/29.379/29379-g11.zip Applications which use this media: Applications supporting the mission critical interworking with LMR systems procedures as described in the published specification. This media type shall contain LMR specific content that is related to the payload that is delivered to a terminating user or an application of the terminating user. Fragment identifier considerations: none Restrictions on usage: none Additional information: 1. Deprecated alias names for this type: none 2. Magic number(s): none 3. File extension(s): none 4. Macintosh file type code: none 5. Object Identifiers: none General Comments: Person to contact for further information: 1. Name: Frederic Firmin, 3GPP Specifications manager 2. Email: frederic.firmin&etsi.org Intended usage: Common see Application usage section above Author/Change controller: i) Author: 3GPP CT1 Working Group/3GPP_TSG_CT_WG1&LIST.ETSI.ORG ii) Change controller: Frederic Firmin / frederic.firmin&etsi.org