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10.1.3.1 General
The IETF RFC 4575 [30] defines a conference event package that shall be used to obtain the status of participants in group sessions. The MCPTT client may subscribe to the conference event package at any time in a group session that the MCPTT client participates in. The clause 10.1.3.2 specifies the procedures in the M...
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10.1.3.2 MCPTT client
A MCPTT client may subscribe to the conference event package when a group call is ongoing and the ongoing group call is not initiated as a broadcast group call by sending a SIP SUBSCRIBE request to obtain information of the status of a group session. When subscribing to the conference event package, the MCPTT client: ...
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10.1.3.3 Participating MCPTT function
Upon receipt of a "SIP SUBSCRIBE request for conference event status subscription in the participating function" from a MCPTT client served by the participating MCPTT function and if the SIP SUBSCRIBE request contains: 1) the ICSI value "urn:urn-7:3gpp-service.ims.icsi.mcptt" (coded as specified in 3GPP TS 24.229 [4])...
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10.1.3.4 Controlling MCPTT function
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10.1.3.4.1 Receiving a subscription to the conference event package
Upon receipt of a "SIP SUBSCRIBE request for conference event status subscription in the controlling MCPTT function" and the SIP SUBSCRIBE request: 1) contains an application/vnd.3gpp.mcptt-info+xml MIME body with a) the <mcptt-request-uri> element set to the group identity of the group session and the <mcptt-calling...
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10.1.3.4.2 Sending notifications to the conference event package
The procedures in this clause is triggered by: 1) the receipt of a SIP SUBSCRIBE request as specified in clause 10.1.3.4.1; 2) the receipt of a SIP BYE request from one of the participants in a pre-arranged, a chat, or an adhoc group session; or 3) when a new participant is added in a pre-arranged, chat, or adhoc gr...
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10.1.3.4.3 Sending subscriptions to the conference event package
The procedure in this clause is triggered by: 1) the receipt of a SIP 200 (OK) response to a SIP INVITE request for non-controlling MCPTT function of an MCPTT group and if at least one participant already has subscribed to the conference event package in the controlling MCPTT function as specified in clause 10.1.3.4.1...
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10.1.3.4.4 Terminating a subscription
Upon receipt of a "SIP SUBSCRIBE request for conference event status subscription in the controlling MCPTT function" that terminates the subscription of the conference event package as specified in IETF RFC 6665 [26], the controlling MCPTT function: 1) shall send a SIP 200 (OK) response as specified in IETF RFC 6665 [...
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10.1.3.5 Non-controlling MCPTT function
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10.1.3.5.1 Receiving subscriptions to the conference event package
Upon receipt of "SIP SUBSCRIBE request for conference event status subscription in the non-controlling MCPTT function" and the SIP SUBSCRIBE request: 1) contains an application/vnd.3gpp.mcptt-info+xml MIME body with a) the <mcptt-request-uri> element set to the constituent MCPTT group ID; and b) the <mcptt-calling-u...
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10.1.3.5.2 Sending notifications to the conference event package
The procedures in this clause is triggered by: 1) the receipt of a receipt of a SIP BYE request from one of the participants in a pre-arranged or a chat group session; or 2) when a new participant is added in a pre-arranged or chat group session. When sending a conference event notification, the non-controlling MCPT...
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10.1.3.5.3 Sending a subscription to the conference event package
Upon receipt of the first subscription to the conference event package from an MCPTT client, the non-controlling MCPTT function: 1) shall generate a SIP SUBSCRIBE request and use a new SIP-dialog according to IETF RFC 6665 [26], IETF RFC 4575 [30] and 3GPP TS 24.229 [4]; 2) shall set the Request-URI of the SIP SUBSCR...
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10.1.3.5.4 Terminating a subscription
Upon receipt of a "SIP SUBSCRIBE request for conference event status subscription in the non-controlling MCPTT function" that terminates the subscription of the conference event package as specified in IETF RFC 6665 [26], the non-controlling MCPTT function: 1) shall send a SIP 200 (OK) response as specified in IETF RF...
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10.1.3.6 Coding
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10.1.3.6.1 Extension of application/conference-info+xml MIME type
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10.1.3.6.1.1 Introduction
The present clause describes an extensions of the application/conference-info+xml MIME body specified in IETF RFC 4575 [30]. The functional alias extension is used to indicate per-user functional alias association with MCPTT group.
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10.1.3.6.1.2 Schema
<?xml version="1.0" encoding="UTF-8"?> <xs:schema targetNamespace="urn:3gpp:ns:mcpttConfInfo:1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:mcpttConfInfo="urn:3gpp:ns:mcpttConfInfo:1.0" elementFormDefault="qualified" attributeFormDefault="unqualified"> <!-- MCPTT specific child element of endp...
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10.1.4 Remote change of an MCPTT user's selected group
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10.1.4.1 General
Clause 10.1.4 specifies the MCPTT client procedures, participating MCPTT function procedures and controlling MCPTT function procedures for the on-network remote change of an MCPTT user's selected group.
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10.1.4.2 Client procedures
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10.1.4.2.1 Remote selected group change initiation
Upon receiving a request from the MCPTT user to send a group selection change request to change the selected group of a targeted MCPTT user to a specific MCPTT group, the MCPTT client: 1) if: a) the <RemoteGroupSelectionURIList> element does not exist in the MCPTT user profile document with one or more <entry> elemen...
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10.1.4.2.2 Target client procedures for handling remote selected group change request
Upon receiving a "SIP MESSAGE request for group selection change request for terminating client", the MCPTT client: 1) if the received SIP MESSAGE request contains an application/vnd.3gpp.mcptt-info+xml MIME body containing an <affiliation-required> element set to a value of "true": a) shall invoke the procedures of ...
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10.1.4.3 Participating MCPTT function procedures
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10.1.4.3.1 Originating procedures
Upon receiving a "SIP MESSAGE request for group-selection-change for originating participating MCPTT function" the participating MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server Internal Error) respo...
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10.1.4.3.2 Terminating procedures
Upon receiving a "SIP MESSAGE request for group-selection-change for terminating participating MCPTT function" the participating MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server Internal Error) respo...
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10.1.4.4 Controlling MCPTT function procedures
Upon receiving: - a "SIP MESSAGE request for group selection change request for controlling MCPTT function"; or - a "SIP MESSAGE request for group selection change response for controlling MCPTT function"; the controlling MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of co...
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10.1.5 Remotely initiated group call
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10.1.5.1 General
Clause 10.1.5 specifies the MCPTT client procedures, participating MCPTT function procedures and controlling MCPTT function procedures for on-network remotely initiated group call. In the procedures clause 10.1.5.2: - the term "requesting MCPTT user" is used to refer to the user who sent a request to initiate a remot...
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10.1.5.2 Client procedures
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10.1.5.2.1 Remotely initiated group call initiation request procedures
Upon receiving a request from the requesting MCPTT user to send a remotely initiated group call request to the remote MCPTT user for a targeted MCPTT group, the MCPTT client: 1) if: a) the <allow-request-remote-init-group-call> element of the <ruleset> element is not present in the requesting MCPTT user's MCPTT user ...
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10.1.5.2.2 Remote client procedures for handling remotely initiated group call request
Upon receiving a "SIP MESSAGE request for remotely initiated group call request for terminating client", the MCPTT client: 1) if the <notify-remote-user> element contained in the application/vnd.3gpp.mcptt-info+xml MIME body contained in the received SIP MESSAGE request is set to a value of "true", may indicate to the...
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10.1.5.3 Participating MCPTT function procedures
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10.1.5.3.1 Originating procedures
In the procedures of this clause: - the term "requesting MCPTT user" is used to refer to the user who sent a request to initiate a remotely initiated group call; and - the term "remote MCPTT user" is used to refer to the user who is sent a request to initiate a remotely initiated group call. Upon receiving a "SIP ME...
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10.1.5.3.2 Terminating procedures
Upon receiving a "SIP MESSAGE request for remotely initiated group call for terminating participating MCPTT function" the participating MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server Internal Error...
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10.1.5.4 Controlling MCPTT function procedures
Upon receiving: - a "SIP MESSAGE request for remotely initiated group call request for controlling MCPTT function"; or - a "SIP MESSAGE request for remotely initiated group call response for controlling MCPTT function"; the controlling MCPTT function: 1) if unable to process the request due to a lack of resources o...
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10.1.6 Change of in-progress imminent peril state of the MCPTT group
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10.1.6.1 General
Clause 10.1.6 specifies the MCPTT client procedures, participating MCPTT function procedures and controlling MCPTT function procedures for the on-network canceling of in-progress imminent peril state of the MCPTT group while there is no MCPTT session is ongoing on the MCPTT group.
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10.1.6.2 Client procedures
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10.1.6.2.1 MCPTT group in-progress imminent peril state cancel initiation
Upon receiving a request from an MCPTT user to cancel the in-progress imminent peril state on a prearranged MCPTT group on which there is no call ongoing, the MCPTT client shall generate a SIP MESSAGE request in accordance with 3GPP TS 24.229 [4] and IETF RFC 3428 [33] with the clarifications given below. NOTE 1: This...
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10.1.6.2.2 Reception of MCPTT group in-progress imminent peril state cancel notification
Upon receiving a "SIP MESSAGE request for imminent peril state change notification for terminating MCPTT client" for the cancellation of the in-progress imminent peril state of the MCPTT group, the MCPTT client: 1) if the received SIP MESSAGE request contains an application/vnd.3gpp.mcptt-info+xml MIME body with the <...
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10.1.6.3 Participating MCPTT function procedures
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10.1.6.3.1 Originating procedures
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10.1.6.3.1.1 Reception of MCPTT group in-progress imminent peril state cancel initiation
Upon receipt of a "SIP MESSAGE request for imminent peril state change request for originating participating MCPTT function", the participating MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server Intern...
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10.1.6.3.2 Terminating Procedures
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10.1.6.3.2.1 Reception of MCPTT group in-progress imminent peril state cancel notification
Upon receipt of a "SIP MESSAGE request for imminent peril state change notification for terminating participating MCPTT function", the participating MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server I...
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10.1.6.4 Controlling MCPTT function procedures
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10.1.6.4.1 Terminating Procedures
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10.1.6.4.1.1 Reception of MCPTT group in-progress imminent peril state cancel initiation
Upon receipt of a "SIP MESSAGE request for imminent peril state change request for controlling MCPTT function", the controlling MCPTT function: 1) if unable to process the request due to a lack of resources or a risk of congestion exists, may reject the SIP MESSAGE request with a SIP 500 (Server Internal Error) respon...
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10.2 Off-network group call
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10.2.1 General
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10.2.1.1 Common Procedures
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10.2.1.1.1 MONP message transport
In order to participate in a call of an MCPTT group, the MCPTT client: 1) shall send the MONP message as a UDP message to the multicast IP address of the MCPTT group, to UDP port 8809, with an IP time-to-live set to 255; and 2) shall treat UDP messages received on the multicast IP address of the MCPTT group and on po...
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10.2.1.1.2 Session description
For an off-network MCPTT session, only MCPTT speech is used. One off-network MCPTT session includes one media-floor control entity. The MCPTT client shall generate an SDP body for a group call in accordance with rules and procedures of RFC4566 [12]. The MCPTT client: 1) shall include in the session-level section: ...
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10.2.2 Basic call control
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10.2.2.1 General
In this release of specification, media streams of off-network group call cannot be modified and the SDP is the same for the entire duration of the call. The maximum number of simultaneous off-network group calls is limited by the value of "/<x>/Common/MCPTTGroupCall/MaxCallN4" leaf node present in the UE configuratio...
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10.2.2.2 Basic call control state machine
The Figure 10.2.2.2-1 gives an overview of the main states and transitions on the UE for call control. Each call control state machine is per MCPTT group ID. Figure 10.2.2.2-1: Basic call control state machine The following pieces of information are associated with the basic call control state machine: a) the s...
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10.2.2.3 Call Control states
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10.2.2.3.1 S1: start-stop
This state exists for UE, when the UE is not part of an ongoing call. This state is the start state of this state machine. This state is the stop state of this state machine.
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10.2.2.3.2 S2: waiting for call announcement
This state exists for UE, when the UE has sent a GROUP CALL PROBE message and is waiting for a GROUP CALL ANNOUNCEMENT message.
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10.2.2.3.3 S3: part of ongoing call
This state exists for UE, when the UE is part of an ongoing group call.
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10.2.2.3.4 S4: pending user action without confirm indication
This state exists for UE, when the UE has presented a notification to the MCPTT user for the received GROUP CALL ANNOUNCEMENT message, is waiting for a response and is not expected to send confirm indication.
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10.2.2.3.5 S5: pending user action with confirm indication
This state exists for UE, when the UE has presented a notification to the MCPTT user for the received GROUP CALL ANNOUNCEMENT message, is waiting for a response and is expected to send confirm indication.
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10.2.2.3.6 S6: ignoring incoming call announcements
This state exists for UE, when the group call was rejected or released, GROUP CALL ANNOUNCEMENT message was sent or received and GROUP CALL ANNOUNCEMENT messages continue being received.
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10.2.2.3.7 S7: waiting for call announcement after call release
This state exists for UE, when the group call was released, GROUP CALL ANNOUNCEMENT message was neither sent nor received and GROUP CALL PROBE was sent.
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10.2.2.4 Procedures
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10.2.2.4.1 General
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10.2.2.4.1.1 Call announcement timer calculation
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10.2.2.4.1.1.1 Periodic call announcement timer calculation
The MCPTT client: 1) shall generate a random number, X, with uniform distribution between 0 and 1; and 2) shall set the TFG2 (periodic announcement) timer as follows: - TFG2 (periodic announcement) = the refresh interval of the call * (2/3 + 2/3*X) seconds.
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10.2.2.4.1.1.2 Call announcement timer calculation after CALL PROBE
The MCPTT client: 1) shall generate a random number, X, with uniform distribution between 0 and 1; and 2) shall set the TFG2 (periodic announcement) timer as follows: - TFG2 (periodic announcement) = 1/12*X seconds.
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10.2.2.4.1.2 Max duration timer calculation
The MCPTT client shall set the TFG6 (max duration) timer as follows: - TFG6 (max duration) = X – (Y – Z) seconds, where: - X = value of "/<x>/<x>/OffNetwork/MaxDuration" leaf node present in group configuration as specified in 3GPP TS 24.483 [45]; - Y = current UTC time, in seconds since midnight UTC of January 1, 1...
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10.2.2.4.2 Call Probe
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10.2.2.4.2.1 Call probe initiation
When in the "S1: start-stop" state, upon an indication from an MCPTT user to initiate a group call for an MCPTT group ID, the MCPTT client: 1) shall store the MCPTT group ID as the MCPTT group ID of the call; 2) shall create a call type control state machine as described in clause 10.2.3.2; 3) shall generate a GROUP...
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10.2.2.4.2.2 Call probe retransmission
When in the "S2: waiting for call announcement" state, upon expiration of TFG3 (call probe retransmission), the MCPTT client: 1) shall generate a GROUP CALL PROBE message as specified in clause 15.1.2. In the GROUP CALL PROBE message, the MCPTT client: a) shall set the MCPTT group ID IE to the stored MCPTT group ID o...
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10.2.2.4.2.3 Receiving GROUP CALL PROBE message when participating in the ongoing call
When in the "S3: part of ongoing call" state, upon receiving a GROUP CALL PROBE message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the MCPTT client: 1) if the stored probe response value of the call is set to "false": a) shall stop timer TFG2 (call announcement); b) shall start timer ...
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10.2.2.4.3 Call setup
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10.2.2.4.3.1 Not receiving any response to GROUP CALL PROBE message
When in the "S2: waiting for call announcement" state, upon expiry of timer TFG1 (wait for call announcement), the MCPTT client: 1) shall stop timer TFG3 (call probe retransmission), if running; 2) shall generate an SDP body as specified in clause 10.2.1.1.2 and store it as the SDP body of the call; 3) shall generat...
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10.2.2.4.3.2 Receiving a GROUP CALL ANNOUNCEMENT message
When in the "S2: waiting for call announcement" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the MCPTT client: 1) shall stop timer TFG3 (call probe retransmission); 2) shall stop timer TFG1 (wait for call announcement); 3) shall st...
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10.2.2.4.3.3 Receiving a GROUP CALL ANNOUNCEMENT message when not participating in the ongoing call
When in the "S1: start-stop" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE not matching MCPTT group ID of the call stored for other state machines, the MCPTT client: 1) shall store the value of the SDP IE of the GROUP CALL ANNOUNCEMENT message as the SDP body of the call; 2) shall...
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10.2.2.4.3.4 MCPTT user accepts the terminating call with confirm indication
When in the "S5: pending user action with confirm indication" state, upon indication from the MCPTT user to accept the incoming group call, the MCPTT client: 1) shall establish a media session based on the stored SDP body of the call; 2) shall start floor control as terminating floor participant as specified in claus...
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10.2.2.4.3.5 MCPTT user accepts the terminating call without confirm indication
When in the "S4: pending user action without confirm indication" state, upon an indication from the MCPTT user to accept the incoming group call, the MCPTT client: 1) shall establish a media session based on the stored SDP body of the call; 2) shall start floor control as terminating floor participant as specified in...
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10.2.2.4.3.6 Receiving GROUP CALL ACCEPT message
When in the "S3: part of ongoing call" state, upon receiving a GROUP CALL ACCEPT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the MCPTT client: 1) can inform the MCPTT user about the call acceptance; and 2) shall remain in the "S3: part of ongoing call" state.
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10.2.2.4.3.7 MCPTT user rejects the terminating call
When in the "S5: pending user action with confirm indication" state or the "S4: pending user action without confirm indication" state, upon an indication from the MCPTT user to reject the incoming group call, the MCPTT client: 1) shall stop timer TFG4 (waiting for the user); 2) shall start timer TFG5 (not present inc...
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10.2.2.4.3.8 MCPTT user does not act on terminating call
When in the "S5: pending user action with confirm indication" state or the "S4: pending user action without confirm indication" state, upon expiration of timer TFG4 (waiting for the user), the MCPTT client: 1) shall start timer TFG5 (not present incoming call announcements); and 2) shall enter the "S6: ignoring incom...
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10.2.2.4.4 Periodic group call announcement
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10.2.2.4.4.1 Sending periodic call announcement
When in the "S3: part of ongoing call" state, upon expiry of timer TFG2 (call announcement), the MCPTT client: 1) shall generate a GROUP CALL ANNOUNCEMENT message as specified in clause 15.1.3. In the GROUP CALL ANNOUNCEMENT message, the MCPTT client: a) shall set the Call identifier IE to the stored call identifier ...
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10.2.2.4.4.2 Receiving periodic call announcement
When in the "S3: part of ongoing call" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the Call start time IE being the same as the stored call start time of the call, the Last call type change time IE being the same as the stored last c...
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10.2.2.4.5 Call release
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10.2.2.4.5.1 MCPTT user leaves the call when GROUP CALL ANNOUNCEMENT was sent or received
When in the "S3: part of ongoing call" state, the "S5: pending user action with confirm indication" state, or the "S4: pending user action without confirm indication" state, upon an indication from the MCPTT user to release the group call, the MCPTT client: 1) shall release the media session, if established; 2) shall...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.2 Receiving GROUP CALL ANNOUNCEMENT message for rejected or released call
When in the "S6: ignoring incoming call announcements" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the MCPTT client: 1) shall store the value of the SDP IE of the GROUP CALL ANNOUNCEMENT message as the SDP body of the call; 2) shal...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.3 MCPTT user initiates originating call for rejected or released call
When in the "S6: ignoring incoming call announcements" state, upon an indication from the MCPTT user to initiate a group call for an MCPTT group ID matching the stored MCPTT group ID of the call, the MCPTT client: 1) stop timer TFG5 (not present incoming call announcements); 2) shall establish a media session based o...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.4 No GROUP CALL ANNOUNCEMENT messages for rejected or released call
When in the "S6: ignoring incoming call announcements" state, upon expiration of timer TFG5 (not present incoming call announcements), the MCPTT client: 1) shall release the stored SDP body of the call; 2) shall release the stored call identifier of the call; 3) shall release the stored originating MCPTT user ID of ...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.5 MCPTT user leaves the call when GROUP CALL PROBE was sent
When in the "S2: waiting for call announcement" state, upon an indication from the MCPTT user to release the group call, the MCPTT client: 1) shall stop timer TFG3 (call probe retransmission); and 2) shall enter the "S7: Waiting for call announcement after call release" state.
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.6 MCPTT user initiates originating call for released call
When in the "S7: Waiting for call announcement after call release" state, upon an indication from the MCPTT user to initiate a group call for an MCPTT group ID matching the stored MCPTT group ID of the call, the MCPTT client: 1) shall stop timer TFG1 (wait for call announcement); 2) shall generate a GROUP CALL PROBE ...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.7 Receiving GROUP CALL ANNOUNCEMENT message for released call
When in the "S7: Waiting for call announcement after call release" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call, the MCPTT client: 1) shall store the value of the SDP IE of the GROUP CALL ANNOUNCEMENT message as the SDP body of the ca...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.8 No GROUP CALL ANNOUNCEMENT messages for released call
When in the "S7: Waiting for call announcement after call release" state, upon expiration of timer TFG1 (wait for call announcement), the MCPTT client: 1) shall release the stored MCPTT group ID of the call; 2) shall destroy the call type control state machine as specified in clause 10.2.3.4.11; and 3) shall enter t...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.5.9 Max duration reached
When in the "S3: part of ongoing call" state, upon expiration of timer TFG6 (max duration), the MCPTT client: 1) shall release the media session; 2) shall stop floor control as specified in clause 7.2.3.9.2 in 3GPP TS 24.380 [5]; 3) shall stop timer TFG2 (call announcement), if running; 4) shall start timer TFG5 (n...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.6 Merge of calls
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.6.1 Merge of two calls
When in the "S3: part of ongoing call" state, upon receiving a GROUP CALL ANNOUNCEMENT message with the MCPTT group ID IE matching the stored MCPTT group ID of the call and: 1) the Originating MCPTT user ID IE is different from the stored originating MCPTT user ID of the call; or 2) the Call identifier IE is differe...
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.7 Error handling
603c77cd0da93e5e476a024643c0ef1c
24.379
10.2.2.4.7.1 Unexpected MONP message received
Upon receiving a MONP message in a state where there is no handling specified for the MONP message, the MCPTT client shall discard the MONP message.