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10.19 Ad hoc group call10.19.1 General10.19.2 Information flows10.19.2.1 Ad hoc group call request (MCPTT client - MCPTT server)10.19.2.2 Ad hoc group call request return (MCPTT server - MCPTT client)10.19.2.3 Ad hoc group call request (MCPTT server - MCPTT server)10.19.2.4 Ad hoc group call request (MCPTT server - MCPTT client)10.19.2.5 Ad hoc group call response (MCPTT server - MCPTT client)10.19.2.6 Ad hoc group call response (MCPTT server - MCPTT server)10.19.2.7 Ad hoc group call response (MCPTT client - MCPTT server)10.19.2.8 Ad hoc group call release request (MCPTT server - MCPTT client)10.19.2.9 Ad hoc group call release response (MCPTT client - MCPTT server)10.19.2.10 Ad hoc group call notify (MCPTT server - MCPTT client)10.19.2.11 Modify ad hoc group call participants request (MCPTT client - MCPTT server)10.19.2.12 Modify ad hoc group call participants response (MCPTT server - MCPTT client)10.19.2.13 Ad hoc group call leave request (MCPTT server - MCPTT client)10.19.2.14 Ad hoc group call leave response (MCPTT client - MCPTT server)10.19.2.15 Ad hoc group call add user notification (MCPTT server - MCPTT server)10.19.2.16 Ad hoc group call remove user notification (MCPTT server - MCPTT server)10.19.2.17 Ad hoc group call release notification (MCPTT server - MCPTT server)10.19.2.18 Ad hoc group call get userlist (MCPTT server - MCPTT server)10.19.2.19 Ad hoc group call get userlist response (MCPTT server - MCPTT server)10.19.2.20 Modify ad hoc group call criteria request (MCPTT client - MCPTT server)10.19.2.21 Modify ad hoc group call criteria response (MCPTT server - MCPTT client)
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10.19  Ad hoc group call |R18|p. 242

10.19.1  Generalp. 242

This subclause contains procedures for ad hoc group call across a one or more MCPTT systems, and associated functions such as emergency call, Imminent peril call, broadcast call and others.
The ad hoc group calls can use the participants list provided by either an initiator of the call or MCPTT server. The MCPTT server can use the criteria provided by the initiator of the call to determine the participants list along with its own criteria or local policies. The resulting ad hoc group uses the configuration of a separate preconfigured MCPTT group.
The preconfigured MCPTT group that provides the configuration is not used for the MCPTT group communication, it only provides configuration for one or more adhoc group calls. The MCPTT group ID of the ad hoc group call is provided by the MCPTT server when the ad hoc group call is originated. In order to establish security context for the end-to-end secured ad hoc group call, the security related information is used from this preconfigured group.
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10.19.2  Information flowsp. 242

10.19.2.1  Ad hoc group call request (MCPTT client - MCPTT server)p. 242

Table 10.19.2.1-1 describes the information flow ad hoc group call request from the MCPTT client to the MCPTT server.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group ID (see NOTE 1)OThe MCPTT group ID to be associated with the ad hoc group communication
Encryption supported (see NOTE 2)OIndicates whether this ad hoc group call supports end-to-end encryption
MCPTT ID list (see NOTE 3, NOTE 6, NOTE 7)OMCPTT IDs of the participants being invited for the ad hoc group call
SDP offerMOffered Media parameters
Implicit floor request (see NOTE 4)OWhen originating client requests the floor, this element shall be included
Broadcast indicator (see NOTE 5)OIndicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 5)OIndicates that the ad hoc group call request is an MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 5)OIndicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
MCPTT ID list (see NOTE 3)OList of participants required to acknowledge the ad hoc group call before start of the audio transmission
Location informationOLocation of the calling party.
Criteria for determining the participants (see NOTE 6, NOTE 7)OCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCPTT server for determining the participants e.g., it can be a location based criteria to invite participants in a particular area
Requested priorityOApplication priority level requested for this group call
NOTE 1:
If this information element is not included, the MCPTT server assigns an MCPTT ad hoc group ID to be used for the ad hoc group communication. This information element is returned to the calling party to use in the ad hoc group communication. If the request follows an ad hoc group for emergency alert, then this element must be present.
NOTE 2:
This information element is present and set to true only if this ad hoc group call is encrypted. When the ad hoc group call is initiated with participants provided by the initiator this acts as an indicator that subsequent requests follow targeting the individual participants and carrying the relevant key material. If this information element is set to false or not present, then this ad hoc group call is unencrypted.
NOTE 3:
This element is included only when the originating client sends the list of participants.
NOTE 4:
This element is included only when the originating client requests the floor.
NOTE 5:
If used, only one of these information elements is present.
NOTE 6:
Only one of these information elements is present.
NOTE 7:
If the request follows an ad hoc group for emergency alert, then this element is not present.
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10.19.2.2  Ad hoc group call request return (MCPTT server - MCPTT client)p. 244

Table 10.19.2.2-1 describes the information flow ad hoc group call request return from the MCPTT server to the MCPTT client. This response could be intermediate response to provide the server assigned MCPTT ad hoc group ID.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
MCPTT ad hoc group ID (see NOTE)OThe MCPTT group ID to be associated with the ad hoc group call which is either provided by the group call initiator or assigned by the MCPTT server. This information element shall be present if the authorization result is success.
Pre-configured group ID (see NOTE)OThe preconfigured MCPTT group ID whose group configuration is to be used for the ad hoc group call (e.g. information for end-to-end security).
Authorization resultMIndicate if authorization is success or failure
NOTE:
These IEs are included only when the Authorization Result IE indicates authorization is successful.
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10.19.2.3  Ad hoc group call request (MCPTT server - MCPTT server)p. 244

Table 10.19.2.3-1 describes the information flow ad hoc group call request between the MCPTT servers.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID to be associated with the ad hoc group call
MCPTT ID list (see NOTE 1, NOTE 3)OMCPTT IDs of the participants being invited for the ad hoc group call
SDP offerMOffered Media parameters of MCPTT server
Broadcast indicator (see NOTE 2)OIndicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 2)OIndicates that the ad hoc group call request is an MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 2)OIndicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
Preconfigured MCPTT group IDOGroup identity whose configuration is to be applied for this ad hoc group call.
Criteria for determining the participants (see NOTE 3)OCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCPTT server for determining the participants e.g., it can be a location based criteria to invite particpants in a particular area
Requested priorityOApplication priority level requested for this group call
NOTE 1:
This element is included only when the originating client sends the list of participants.
NOTE 2:
If used, only one of these information elements is present.
NOTE 3:
Only one of these information elements is present.
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10.19.2.4  Ad hoc group call request (MCPTT server - MCPTT client)p. 245

Table 10.19.2.4-1 describes the information flow ad hoc group call request from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
MCPTT IDMThe identity of the MCPTT user towards which the request is sent
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID to be associated with the ad hoc group call
SDP offerMOffered Media parameters of MCPTT server
Broadcast indicator (see NOTE 1)OIndicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 1)OIndicates that the ad hoc group call request is an MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 1)OIndicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
Preconfigured MCPTT group IDOGroup identity whose configuration is to be applied for this ad hoc group call.
NOTE 1:
If used, only one of these information elements is present.
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10.19.2.5  Ad hoc group call response (MCPTT server - MCPTT client)p. 246

Table 10.19.2.5-1 describes the information flow ad hoc group call response from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group call
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the group call request (success or failure)
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10.19.2.6  Ad hoc group call response (MCPTT server - MCPTT server)p. 246

Table 10.19.2.6-1 describes the information flow ad hoc group call response between the MCPTT servers.
Information element Status Description
MCPTT IDMThe MCPTT ID of the target MCPTT user
Functional aliasOThe functional alias of the target MCPTT user
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group call
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the ad hoc group call request (success or failure)
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10.19.2.7  Ad hoc group call response (MCPTT client - MCPTT server)p. 247

Table 10.19.2.7-1 describes the information flow ad hoc group call response from the MCPTT client to the MCPTT server.
Information element Status Description
MCPTT IDMThe MCPTT ID of the target MCPTT user
Functional aliasOThe functional alias of the target MCPTT user
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group call
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the ad hoc group call request (success or failure)
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10.19.2.8  Ad hoc group call release request (MCPTT server - MCPTT client)p. 247

Table 10.19.2.8-1 describes the information flow ad hoc group call release request from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the ad hoc group call participant
Functional aliasOThe functional alias of the ad hoc group call participant
MCPTT ad hoc group IDMThe MCPTT group ID of the ad hoc group call on which call is released
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10.19.2.9  Ad hoc group call release response (MCPTT client - MCPTT server)p. 247

Table 10.19.2.9-1 describes the information flow ad hoc group call release response from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the ad hoc group call participant
Functional aliasOThe functional alias of the ad hoc group call participant
MCPTT ad hoc group IDMThe MCPTT group ID of the ad hoc group call that is released
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10.19.2.10  Ad hoc group call notify (MCPTT server - MCPTT client)p. 248

Table 10.19.2.10-1 describes the information flow ad hoc group call notify from MCPTT server to MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of ad hoc group call participant
Functional aliasOThe associated functional alias of the MCPTT user of the ad hoc group call participant
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group call
MCPTT ID listOThe list of the invited MCPTT users who did not acknowledge the ad hoc group call request within a configured time or the list of the invited MCPTT users who acknowledged the ad hoc group call request and joined or the list of the MCPTT users who joined or left the ongoing MCPTT ad hoc group call.
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10.19.2.11  Modify ad hoc group call participants request (MCPTT client - MCPTT server)p. 248

Table 10.19.2.11-1 describes the information flow Modify ad hoc group call participants request from the MCPTT client to the MCPTT server.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call whose participants list needs to be modified
MCPTT ID list (see NOTE)OList of additional MCPTT users to be added to the on-going ad hoc group call
MCPTT ID list (see NOTE)OList of MCPTT users to be removed from the on-going ad hoc group call
NOTE:
Either one or both of these information elements is present
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10.19.2.12  Modify ad hoc group call participants response (MCPTT server - MCPTT client)p. 248

Table 10.19.2.12-1 describes the information flow Modify ad hoc group call participants response from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call whose participants list needs to be modified
ResultMResult of the modify ad hoc group call participants request (success of failure)
MCPTT ID listOList of MCPTT users who are not allowed to be added to the on-going ad hoc group call. This list is provided if the operation is partially success.
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10.19.2.13  Ad hoc group call leave request (MCPTT server - MCPTT client)p. 249

Table 10.19.2.13-1 describes the information flow ad hoc group call leave request from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the ad hoc group call participant leaving the call
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call on which call is on-going
Reason to leaveOCarries the reason of why the MCPTT client is being asked to leave the ongoing ad hoc group call
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10.19.2.14  Ad hoc group call leave response (MCPTT client - MCPTT server)p. 249

Table 10.19.2.14-1 describes the information flow Ad hoc group call leave response from the MCPTT client to the MCPTT server.
Information element Status Description
MCPTT IDMThe MCPTT ID of the ad hoc group call participant leaving the call
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call on which call is on-going
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10.19.2.15  Ad hoc group call add user notification (MCPTT server - MCPTT server)p. 249

Table 10.19.2.15-1 describes the information flow Ad hoc group call add user notification from one MCPTT server to another MCPTT server. This notification is to provide the list of MCPTT IDs meeting the criteria specified in the ad hoc group communication get userlist request from one MCPTT server to another MCPTT server.
Information element Status Description
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group communication
MCPTT ID listMList of MCPTT IDs meeting the criteria specified in the ad hoc group communication get userlist
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10.19.2.16  Ad hoc group call remove user notification (MCPTT server - MCPTT server)p. 250

Table 10.19.2.16-1 describes the information flow Ad hoc group call remove user notification from one MCPTT server to another MCPTT server. This notification is to provide the list of MCPTT IDs no longer meeting the criteria specified in the ad hoc group communication get userlist request from one MCPTT server to another MCPTT server.
Information element Status Description
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group communication
MCPTT ID listMList of MCPTT IDs no longer meeting the criteria specified in the ad hoc group communication get userlist
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10.19.2.17  Ad hoc group call release notification (MCPTT server - MCPTT server)p. 250

Table 10.19.17-1 describes the information flow Ad hoc group call release notification from one MCPTT server to another MCPTT server. This notification is to indicate to stop evaluating the criteria to determine the participants list if another MCPTT server is having the criteria specified in the ad hoc group communication get userlist request
Information element Status Description
MCPTT ad hoc group IDMThe MCPTT group ID associated with the ad hoc group communication
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10.19.2.18  Ad hoc group call get userlist (MCPTT server - MCPTT server)p. 250

Table 10.19.2.18-1 describes the information flow ad hoc group call get userlist between MCPTT servers.
Information element Status Description
MCPTT ad hoc group IDMThe associated MCPTT group ID of the ad hoc group call
Criteria for determining the participantsMCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCPTT server for determining the participants e.g., it can be a location based criteria to invite participants in a particular area
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10.19.2.19  Ad hoc group call get userlist response (MCPTT server - MCPTT server)p. 251

Table 10.19.2.19-1 describes the information flow ad hoc group call get userlist response between MCPTT servers.
Information element Status Description
MCPTT ad hoc group IDMThe associated MCPTT group ID of the ad hoc group call
MCPTT ID listMList of MCPTT IDs meeting the criteria specified in the ad hoc group call get userlist
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10.19.2.20  Modify ad hoc group call criteria request (MCPTT client - MCPTT server) |R19|p. 251

Table 10.19.2.20-1 describes the information flow Modify ad hoc group call criteria request from the MCPTT client to the MCPTT server.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call whose participants list needs to be modified
Criteria to determine the list of participantsOCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCPTT server for determining the participants e.g., it can be a location-based criteria to invite participants in a particular area
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10.19.2.21  Modify ad hoc group call criteria response (MCPTT server - MCPTT client) |R19|p. 251

Table 10.19.2.21-1 describes the information flow Modify ad hoc group call criteria response from the MCPTT server to the MCPTT client.
Information element Status Description
MCPTT IDMThe MCPTT ID of the calling party
Functional aliasOThe functional alias of the calling party
MCPTT ad hoc group IDMThe MCPTT group ID of ad hoc group call whose participants list needs to be modified
ResultMResult of the modify ad hoc group call participants request (success of failure)
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