Content for TS 23.334 Word version: 17.2.0
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8 Messages/Procedures and Contents p. 169
8.1 General p. 169
This clause describes logical signalling procedures between the IMS-ALG and IMS-AGW. The procedures within this clause are intended to be implemented using the standard H.248 procedure as defined in ITU recommendation H.248.1 [9] with appropriate parameter combinations.
8.2 Reserve and Configure AGW Connection Point p. 170
This procedure is used to reserve multimedia-processing resources for the Iq interface connection.
| Procedure | Initiated | Information element name | Information element required | Information element description |
|---|---|---|---|---|
| Reserve and Configure AGW Connection Point | IMS-ALG | Context/Context Request | M | This information element indicates the existing context or requests a new context for the bearer termination. |
| Emergency Call Indicator | O | This information element identifies the call as emergency call that requires a preferential handling. | ||
| Priority information | O | This information element requests the IMS-AGW to apply priority treatment for the terminations and bearer connections in the specified context. | ||
| Bearer Termination Request | M | This information element indicates the existing bearer termination or requests a new bearer termination for the bearer to be established. | ||
| Local IP Resources | O | This information element indicates the resource(s) for which the IMS-AGW shall be prepared to receive user data. May be excluded (i.e. "-" is used in SDP m-line) if no transcoding or media related functions are required. For terminations supporting any combination of video, audio and messaging this IE shall contain separate resources per stream. | ||
| ReserveValue | O | This information element indicates if multiple local resources are to be reserved. This information element shall be included if a speech codec and auxiliary payload types are configured. | ||
| Remote IP Resources | O | This information element indicates the resource(s) for which the IMS-AGW shall send data. For terminations supporting any combination of video, audio and messaging this IE shall contain separate resources per stream. May be excluded (i.e. "-" is used in SDP m-line) if no transcoding or media related functions are required. | ||
| Local Connection Address Request | M | This information element requests an IP address and port number(s) on the IMS-AGW that the remote end can send user plane data to. For terminations supporting any combination of video, audio and messaging this may contain multiple addresses. | ||
| Remote Connection Address | M | This information element indicates the remote IP address and port number(s) that the IMS-AGW can send user plane data to. For terminations supporting any combination of video, audio and messaging this may contain multiple addresses. | ||
| Notify termination heartbeat | M | This information element requests termination heartbeat indications. This information element shall be included when requesting a new bearer termination. Otherwise the information element is optional. | ||
| Notify Released Bearer | O | This information element requests a notification of a released bearer. | ||
| Latching Requirement | O | This information element indicates that the IMS-AGW should (re)latch onto the address of received media packets to determine the corresponding destination address. | ||
| IP Realm Identifier | O | This information element indicates the IP realm of the bearer termination. | ||
| Remote Source Address Filtering | O | This information element indicates that remote source address filtering is required. | ||
| Remote Source Address Mask | C | This information element provides information on the valid remote source addresses. This is required if a range of remote source address filtering is required. | ||
| Remote Source Port Filtering | O | This information element indicates that remote source port filtering is required. | ||
| Remote Source Port | C | This information element identifies the valid remote source port. This may be included if remote source port filtering is included. (NOTE 1) | ||
| Remote Source Port Range | C | This information element identifies a range of valid remote source ports. This may be included if remote source port filtering is included. (NOTE 1) | ||
| Traffic Policing Required | O | This information element indicates that policing of the media flow is required. | ||
| Peak Data Rate | O | This information element may be present if Policing is required and specifies the permissible peak data rate for a media stream. (NOTE 2). | ||
| Sustainable Data Rate | O | This information element may be present if Policing is required and specifies the permissible sustainable data rate for a media stream. (NOTE 2). | ||
| Delay Variation Tolerance | O | This information element may be present if Policing on Peak Data Rate is required and specifies the maximum expected delay variation tolerance for the corresponding media stream. | ||
| Maximum Burst Size | C | This information element shall be present if Policing on Sustainable Data Rate is required and specifies the maximum expected burst size for the corresponding media stream. | ||
| DiffServ Code Point | O | This information element indicates a specific DiffServ code point to be used in the IP header in packets sent on the bearer termination. | ||
| DiffServ Tagging Behaviour | O | This information element indicates whether the Diffserv code point in the IP header in packets sent on the bearer termination shall be copied from the received value or set to a specific value. | ||
| Media Inactivity Detection Required | O | This information element indicates that detection of inactive media flows is required. | ||
| Media Inactivity Detection Time | C | This information element may be present if Inactive Media Detection is required and specifies the Inactivity Detection time. | ||
| Media Inactivity Detection Direction | C | This information element may be present if Inactive Media Detection is required and specifies the Inactivity Detection direction. | ||
| RTCP handling | O | This information element is present if IMS-ALG wants to explicitly control the reservation of RTCP resources (NOTE 4). | ||
| RTP/RTCP transport multiplexing | C | This information element requests the IMS-AGW to apply the RTP/RTCP transport multiplexing. This information element may only be present if RTCP handling is required. | ||
| Explicit RTCP transport address | C | This information element indicates the remote RTCP port and optionally the remote network address where to send RTCP packets. This information element may only be present if RTCP handling is required. | ||
| Local cryptographic SDES attribute | C | This information element is present if IMS-ALG wants that the media is encrypted and/or integrity protected by the IMS-AGW (NOTE 3). It indicates the SDES local cryptographic parameters such as key(s) | ||
| Remote cryptographic SDES attribute | C | This information element is present if IMS-ALG wants that the media is decrypted, and/or integrity checked by the IMS-AGW (NOTE 3). It indicates the SDES remote cryptographic parameters such as key(s) | ||
| ECN Enable | O | This information element requests the IMS-AGW to apply ECN procedures. | ||
| ECN Initiation Method | C | This information element specifies the ECN Initiation method and requests the IMS-AGW to perform IP header settings as an ECN endpoint, or indicates that ECN bits shall be passed transparently. It may be included only if ECN is enabled. | ||
| Notify ECN Failure Event | C | This information element requests a notification if a ECN failure occurs due to ECN. It may only be supplied if ECN is enabled and the IMS-AGW acts as ECN endpoint. | ||
| Extended RTP Header for CVO | O | This information element requests the IMS-AGW to pass on the CVO extended RTP header as defined by RFC 5285. | ||
| Extended RTP Header for Sent ROI | O | This information element requests the IMS-AGW to pass on the ROI extended RTP header for carriage of predefined and/or arbitrary ROI information as defined by RFC 5285 and TS 26.114. | ||
| Predefined ROI | O | This information element requests the IMS-AGW to support the RTCP feedback message capability for "Predefined ROI" type expressed by the parameter "3gpp-roi-predefined", as described in TS 26.114. | ||
| Arbitrary ROI | O | This information element requests the IMS-AGW to support the RTCP feedback message capability for "Arbitrary ROI" type expressed by the parameter "3gpp-roi-arbitrary", as described in TS 26.114. | ||
| Generic Image Attributes | O | This information element indicates image attributes (e.g. image size) as defined by RFC 6236. | ||
| Local certificate fingerprint Request | O | This information element is present if the IMS-ALG wants that the media is decrypted, and/or integrity protected by the IMS-AGW (NOTE 3). It requests the IMS-AGW to provide a local certificate fingerprint. | ||
| Remote certificate fingerprint | O | This information element is present if the IMS-ALG wants that the media is decrypted, and/or integrity checked by the IMS-AGW (NOTE 3). It indicates the remote certificate fingerprint. | ||
| Establish (D)TLS session | O | This information element requests the IMS-AGW to take the (D)TLS client role and to initiate the establishment of the (D)TLS session. (NOTE 3) | ||
| Notify (D)TLS session establishment Failure Event | O | This information element requests a notification if a (D)TLS session establishment failure occurs. (NOTE 3) | ||
| TCP State-aware Handling Indicator and Setup Direction | C | This information element indicates that TCP state-aware handing is required and indicates the TCP setup direction. It may only be included if the IMS-AGW supports TCP state-aware handling. | ||
| Discard Incoming TCP Connection Establishment Requests Indicator | C | This information element indicates whether incoming TCP connection establishment requests (TCP SYN) shall be discarded. It may only be included if the IMS-AGW supports TCP state-aware handling and discarding incoming TCP connection establishment requests. | ||
| Forward Incoming TCP Connection Establishment Requests Indicator | C | This information element indicates for a given termination to use the incoming TCP connection establishment request (TCP SYN) at that termination as a trigger for sending a TCP connection establishment request at the interconnected termination in the same context. It may only be included if the IMS-AGW supports TCP state-aware handling and the Forward Incoming TCP Connection Establishment Requests Indicator. | ||
| Notify TCP Connection Establishment Failure Event | C | This information element requests a notification if a TCP connection establishment failure occurs. It may only be included if the IMS-AGW supports TCP state-aware handling. | ||
| STUN server request | O | This information element is present if IMS-ALG requests the IMS-AGW to answer STUN connectivity checks for ICE. | ||
| ICE Connectivity Check | C | This information element requests the IMS-AGW to perform ICE connectivity check as defined by RFC 8445. It is only applicable for full ICE. | ||
| Notify ICE Connectivity Check Result | C | This information element requests a notification of ICE connectivity check result. It is only applicable for full ICE. | ||
| Notify New Peer Reflexive Candidate | C | This information element requests a notification of new peer reflexive candidate was discovered during a connectivity check. It is only applicable for full ICE. | ||
| ICE password request | O | This information element is present if IMS-ALG requests an ICE password. | ||
| ICE Ufrag request | O | This information element is present if IMS-ALG requests an ICE ufrag. | ||
| ICE host candidate request | O | This information element is present if IMS-ALG requests an ICE host candidate. | ||
| ICE pacing request | O | This information element is present if IMS-ALG requests a pacing value for connectivity checks (Ta timer value). It is only applicable for full ICE. | ||
| ICE received candidate | O | This information element is present if IMS-ALG indicates a received candidate for ICE. | ||
| ICE received password | O | This information element is present if IMS-ALG indicates a received password for ICE. | ||
| ICE received Ufrag | O | This information element is present if IMS-ALG indicates a received Ufrag for ICE. | ||
| ICE received pacing | O | This information element is present if IMS-ALG indicates a received pacing value for connectivity checks (Ta timer value). It is only applicable for full ICE. It is only applicable for full ICE. | ||
| MSRP Path | O | This information element is present for application-aware MSRP Interworking. It provides the path information that the IMS-AGW shall insert in the MSRP layer "To-Path" Information element. | ||
| Application-aware MSRP interworking request | O | This information element is present if IMS-ALG requests the IMS-AGW to perform application-aware MSRP Interworking. | ||
| Notify STUN consent freshness test failure Event | O | This information element requests a notification if a STUN consent freshness test failure occurs (full ICE only). | ||
| STUN consent freshenss test request | O | This information element is present if eP-CSCF requests the eIMS-AGW to perform a STUN consent freshness test (full ICE only). | ||
| Local SCTP Port Request | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It requests the IMS-AGW to provide a local SCTP Port. | ||
| Remote SCTP Port | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It indicates the remote SCTP port. | ||
| Local SCTP maximum message size Request | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It requests the IMS-AGW to provide a local max message size. | ||
| Remote SCTP maximum message size | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It indicates the remote max message size. | ||
| SCTP Group Semantics | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It indicates the H.248 component streams that are grouped in the same SCTP association. | ||
| SCTP stream deaggregation | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an SCTP association. It indicates the H.248 component streams that transport media that are to be deaggregated from the H.248 deaggregation stream used to control the SCTP association. | ||
| SCTP stream ID | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish an WEBRTC data channel. It indicates the SCTP stream ID to be used for that data channel. | ||
| Local Dcmap | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish the WEBRTC data channel. It indicates the information within an SDP "dcmap" attribute sent towards the remote peer, including the Subprotocol to exchange via the data channel. | ||
| Remote Dcmap | O | This information element is present if the IMS-ALG requests the IMS-AGW to establish the WEBRTC data channel. It indicates the information within an SDP "dcmap" attribute received from the remote peer, including the Subprotocol to exchange via the data channel. | ||
| Local Dcsa | O | This information element can be present if the IMS-ALG requests the IMS-AGW to establish the WEBRTC data channel and to handle its contents in an application-aware manner. It indicates the information within an SDP "dcsa" attribute sent towards the remote peer, encapsulating a subprotocol specific SDP attribute. | ||
| Remote Dcsa | O | This information element can be present if the IMS-ALG requests the IMS-AGW to establish the WEBRTC data channel and to handle its contents in an application-aware manner. It indicates the information within an SDP "dcsa" attribute received from the remote peer, encapsulating a subprotocol specific SDP attribute. | ||
| Received SCTP Stream Reset Request | O | This information element is present if the eP-CSCF (IMS-ALG) requests the eIMS-AGW to establish the WEBRTC data channel. It requests the eIMS-AGW to provide a notification when receiving an SCTP Stream reset request | ||
| Allowed RTCP APP message types | O | This information element is present if IMS-ALG allows the IMS-AGW to send RTCP APP packets of the indicated types. The IMS-AGW shall not send other RTCP APP packets. If the parameter is not supplied, the IMS-AGW shall not send any RTCP APP packets.and to autonomously answer that SCTP Stream reset request | ||
| SDPCapNeg configuration | O | This information element provides SDPCapNeg configuration(s) using as "a=acap", "a=tcap", "a=pcfg" and "a=acfg" SDP attributes. | ||
| Additional Bandwidth Properties | O | This information element indicates additional bandwidth properties using "a=bw-info" SDP attribute(s) as defined by TS 26.114. | ||
| CCM BASE | O | This information element indicates that the IMS-AGW shall be prepared to receive and is allowed to send, respectively, the RTCP feedback "CCM FIR" and/or "CCM TMMBR" messages (defined in RFC 5104). | ||
| CCM pause-resume | O | This information element indicates to the IMS-AGW that RTCP feedback "CCM PAUSE-RESUME" messages shall be passed transparently. | ||
| Reserve and Configure AGW Connection Point Ack | IMS-AGW | DBI | O | This information element indicates to the IMS-AGW that RTCP DBI feedback messages (as defined in clause 7.3.8 of TS 26.114) shall be passed transparently. |
| Context | M | This information element indicates the context where the command was executed. | ||
| Bearer Termination | M | This information element indicates the bearer termination where the command was executed. | ||
| Local IP Resources | C | This information element indicates the resource(s) for which the IMS-AGW shall be prepared to receive user data. This IE shall be present if it was contained in the request. If the IE was not contained in the request, it may be present in the reply. For terminations supporting any combination of video, audio and messaging this IE shall contain separate resources per stream. | ||
| Remote IP Resources | O | This information element indicates the resource(s) for which the IMS-AGW shall send data. For terminations supporting any combination of video, audio and messaging this IE shall contain separate resources per stream. | ||
| Local Connection Address | M | This information element indicates the IP address and port number(s) the IMS-AGW shall receive user plane data from IMS. For terminations supporting any combination of video, audio and messaging this may contain multiple addresses. | ||
| Remote Connection Address | O | This information element indicates the remote IP address and port number(s) that the IMS-AGW can send user plane data to. For terminations supporting any combination of video, audio and messaging this may contain multiple addresses. | ||
| Local cryptographic SDES attribute | C | This information element may be present only if it was contained in the request. It indicates the SDES local cryptographic parameters such as key(s) | ||
| Remote cryptographic SDES attribute | C | This information element may be present only if it was contained in the request. It indicates the SDES remote cryptographic parameters such as key(s) | ||
| Local certificate fingerprint | C | This information element may be present only if the Local certificate fingerprint Request was contained in the request. It indicates the local certificate fingerprint. (NOTE 3) | ||
| ICE password | C | This information element shall be present only if it was contained in the request. It indicates the ICE password assigned by the IMS-AGW. | ||
| ICE Ufrag | C | This information element shall be present only if it was contained in the request. It indicates the ICE Ufrag assigned by the IMS-AGW. | ||
| ICE host candidate | C | This information element shall be present only if it was contained in the request. It indicates the ICE host candidate assigned by the IMS-AGW. | ||
| ICE pacing | C | This information element shall be present only if it was contained in the request. It indicates a desired pacing value for connectivity checks (Ta timer value). | ||
| Local SCTP Port | C | This information element may be present only if the Local SCTP Port Request was contained in the request. It indicates the local SCTP Port. | ||
| Local SCTP maximum message size | C | This information element may be present only if the Local max message size Request was contained in the request. It indicates the local max message size. | ||
| ICE lite indication | C | This information element shall be present only if an ICE host candidate request was contained in the request, and the IMS-AGW supports ICE lite, but not full ICE. It indicates that the IMS-AGW only supports ICE lite. | ||
| SDPCapNeg configuration | C | This information element shall be present only if it was contained in the request. It provides SDPCapNeg configuration(s) using as "a=acap", "a=tcap", "a=pcfg" and "a=acfg" SDP attributes. | ||
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NOTE 1:
Remote Source Port and Remote Source Port Range are mutually exclusive.
NOTE 2:
One of those IEs shall at least be present when policing is required.
NOTE 3:
This IE may only be present for access network terminations.
NOTE 4:
The concerned RTCP resource component is related to the RTCP port value.
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