Content for TS 33.107 Word version: 18.0.0
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21 Invocation of Lawful Interception for Push to talk over Cellular services
21.0 General
21.1 Provision of IRI - PTC Service
21.2 Provision of Content - PTC Service
21.3 Provision of Interception
21.4 PTC Surveillance Events
21.5 PTC Group Calls
21.6 MCPTT Priority Calls and Alerts Messages
21.7 PTC Communication Content (CC)
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21 Invocation of Lawful Interception for Push to talk over Cellular services |R14| p. 239
21.0 General p. 239
21.1 Provision of IRI - PTC Service p. 240
21.1.0 Introduction |R15| p. 240
21.1.1 Decryption for PTC services |R15| p. 241
21.1.2 Signalling over the Xk interfaces and LI events |R15| p. 242
21.2 Provision of Content - PTC Service p. 243
21.3 Provision of Interception p. 244
21.3.1 X3-Interface p. 244
21.3.2 X2-interface p. 244
21.3.3 LI Defined Events p. 244
21.3.4 Events Elements p. 245
21.3.4.1 IRI Event Elements p. 245
21.3.4.2 CC Event Elements p. 249
21.4 PTC Surveillance Events p. 249
21.4.0 PTC General p. 249
21.4.1 PTC Service Registration p. 249
21.4.2 PTC Serving System p. 250
21.4.3 PTC Session Initiation p. 250
21.4.4 PTC Session Abandon p. 251
21.4.5 PTC Session Start p. 251
21.4.6 PTC Session End p. 252
21.4.7 PTC Start of Interception p. 252
21.4.8 PTC Pre-Established Session p. 253
21.4.9 PTC Instant Personal Alert p. 253
21.4.10 PTC Party Join event p. 254
21.4.11 PTC Party Drop p. 254
21.4.12 PTC Party Hold p. 255
21.4.13 PTC Party Retrieve p. 255
21.4.14 PTC Media Modification p. 256
21.4.15 PTC Group Advertisement p. 256
21.4.16 PTC Floor Control p. 257
21.4.17 PTC Target Presence p. 257
21.4.18 PTC Associate Presence p. 258
21.4.19 PTC List Management Events p. 258
21.4.20 PTC Access Policy event p. 258
21.4.21 PTC Media Type Notification p. 260
21.4.22 PTC Encryption Message |R15| p. 260
21.5 PTC Group Calls p. 261
21.5.1 General p. 261
21.5.2 Group Call Request p. 261
21.5.3 Group Call Response p. 261
21.5.4 PTC Group Interrogate p. 262
21.6 MCPTT Priority Calls and Alerts Messages p. 262
21.6.0 Background p. 262
21.6.1 General p. 262
21.6.2 MCPTT Emergency Group Call p. 262
21.6.3 MCPTT Emergency Group Call Cancel p. 263
21.6.4 MCPTT Emergency Group Alert p. 263
21.6.5 MCPTT Emergency Group State p. 264
21.6.6 MCPTT Imminent Peril Group Call p. 264
21.7 PTC Communication Content (CC) p. 264
21.7.0 General p. 264
21.7.1 Communication Content (CC) p. 265
