Showing content from http://www.iana.org/assignments/sip-parameters below:
Session Initiation Protocol (SIP) Parameters
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 [RFC6809] 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 [RFC6809] [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 [RFC6809] 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 [RFC6809] 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 [RFC6809] [60] indicates support of the CS to PS single radio voice call continuity as specified in 3GPP TS 24.237. [3GPP TS 24.237 11.10.0][Frederic_Firmin] g.3gpp.ti This feature-capability indicator when used in a Feature-Caps header field as specified in IETF [RFC6809] 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. [3GPP TS 24.237 11.10.0][Frederic_Firmin] g.3gpp.loopback This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] in a SIP INVITE request, indicates the support of the roaming architecture for voice over IMS with local breakout. [3GPP TS 24.229][Frederic_Firmin] g.3gpp.trf This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] 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. [3GPP TS 24.229 11.11.0][Frederic_Firmin] g.3gpp.home-visited This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] 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. [3GPP TS 24.229][Frederic_Firmin] g.3gpp.mrb This feature-capability indicator when included in a Feature-Caps header field as specified in [RFC6809] in 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. [3GPP TS 24.229 11.11.0][Frederic_Firmin] 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 [RFC6809], 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. [3GPP TS 24.229 11.12.0][Frederic_Firmin] g.3gpp.drvcc-alerting This feature-capability indicator when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP INVITE request or a SIP response to the SIP INVITE request indicates support of PS to CS dual radio access transfer for calls in alerting phase. [3GPP TS 24.237 12.8.0][Frederic_Firmin] g.3gpp.dynamic-stn This feature-capability indicator g.3gpp.dynamic-stn, when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP INVITE request or a SIP response to the SIP INVITE request, indicates support to transfer the session to the circuit switched (CS) domain using the dynamic STN (session transfer number) digit string. [3GPP TS 24.237 12.8.0][Frederic_Firmin] g.3gpp.ps2cs-drvcc-orig-pre-alerting This feature-capability indicator g.3gpp.ps2cs-srvcc-orig-pre-alerting 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 PS to CS SRVCC for originating calls in pre-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 the PS to CS SRVCC for originating calls in pre-alerting phase. [3GPP TS 24.237 12.8.0][Frederic_Firmin] g.3gpp.ps2cs-srvcc-orig-pre-alerting This feature-capability indicator g.3gpp.ps2cs-srvcc-orig-pre-alerting 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 PS to CS SRVCC for originating calls in pre-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 the PS to CS SRVCC for originating calls in pre-alerting phase. [3GPP TS 24.237 12.8.0][Frederic_Firmin] g.3gpp.cs2ps-drvcc-alerting This feature-capability indicator, when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP request or a SIP response to the SIP request, indicates support of CS to PS dual radio access transfer for calls in alerting phase. [3GPP TS 24.237 12.9.0][Frederic_Firmin] g.3gpp.cs2ps-drvcc-orig-pre-alerting This feature-capability indicator when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP request or a SIP response to the SIP request indicates support of CS to PS dual radio access transfer for originating calls in pre-alerting phase. [3GPP TS 24.237 12.9.0][Frederic_Firmin] g.3gpp.ics This feature-capability indicator when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP initial request for dialog or a response associated with the SIP initial request indicates support of IMS Centralized Services (ICS). [3GPP TS 24.292 12.8.0][Frederic_Firmin] g.3gpp.registration-token This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] [190] in a SIP REGISTER request, indicates the support of using a token to identify the registration used for the request. This feature-capability indicator can be included in an originating initial INVITE request to identify which registration was used for this request by setting the indicator to the same value as in the +g.3gpp.registration-token media feature tag in the Contact header field of the REGISTER request. This feature-capability indicator can be included in any response to a terminating INVITE request to identify which registration was used for the response by setting the indicator to the same value as in the +g.3gpp.registration-token media feature tag in the Contact header field of the REGISTER request. [3GPP TS 24.229 12.16.0][Frederic_Firmin] g.3gpp.verstat This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] in a 200 (OK) response to a REGISTER request, indicates that the home network supports calling party number verification, as described in [RFC8224]. [3GPP TS 24.229 v14.7.0][Frederic_Firmin] g.3gpp.mcvideo.ambient-viewing-call-release This feature-capability indicator when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP INVITE request or a SIP 200 (OK) response to a SIP INVITE request indicates that the MCVideo server is capable of receiving a SIP BYE from an MCVideo client to release an ambient-viewing call. [3GPP TS 24.281 Rel-15][Frederic_Firmin] g.3gpp.mcptt.ambient-listening-call-release This feature-capability indicator when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP INVITE request or a SIP 200 (OK) response to a SIP INVITE request indicates that the MCPTT server is capable of receiving a SIP BYE from an MCPTT client to release an ambient-listening call. [3GPP TS 24.379 v14.5.0][Frederic_Firmin] g.3gpp.dynamic-e-stn-drvcc This feature-capability indicator, when included in a Feature-Caps header field as specified in IETF [RFC6809] in a SIP response to a SIP INVITE request, indicates support to transfer the session to the circuit switched (CS) domain using the Emergency Session Transfer Number for DRVCC digit string. [3GPP TS 24.237][Frederic_Firmin] g.3gpp.ps2cs-srvcc-term-pre-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 the PS to CS SRVCC for terminating calls in pre-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 the PS to CS SRVCC for terminating calls in pre-alerting phase. [3GPP TS 24.237][Frederic_Firmin] g.3gpp.priority-share When included in a Feature-Caps header field in SIP requests or SIP responses, the sender indicates that priority sharing is supported. [3GPP TS 24.229 13.16.0][Frederic_Firmin] g.3gpp.thig-path This feature-capability indicator when included in a Feature-Caps header field as specified in [RFC6809] in a 200 (OK) response to the REGISTER request indicates that in a roaming scenario, the visited network IBCF supports topology hiding of a Path header field. [3GPP TS 24.229] g.3gpp.anbr This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] in a 200 (OK) response to a REGISTER request, indicates that the network supports ANBR as specified in 3GPP TS 26.114. [3GPP TS 24.229] g.3gpp.in-call-access-update This feature-capability indicator, when included in a Feature-Caps header field as specified in [RFC6809] in a SIP INVITE request or a response to a SIP INVITE, indicates that the entity supports in-call access update procedure specified in 3GPP TS 24.229. The value of this feature capability indicator is a SIP URI to where the entity can be reached. [3GPP TS 24.229] g.3gpp.datachannel This feature-capability indicator indicates the support of data channel capability in the network, and can be included in a Feature-Caps header field as specified in [RFC6809] in a 200 (OK) response to the REGISTER request. [3GPP TS 24.186]
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