5  Elementary procedures for circuit-switched Call Control  Word‑p. 266

5.1  Overview

5.1.1  General

5.1.2  Call Control States  Word‑p. 274

5.1.2.1  Call states at the mobile station side of the interface

5.1.2.1.1  Null (State U0)

5.1.2.1.2  MM Connection pending (U0.1)

5.1.2.1.2a  CC prompt present (U0.2) $(CCBS)$

5.1.2.1.2b  Wait for network information (U0.3) $(CCBS)$

5.1.2.1.2c  CC-Establishment present (U0.4) $(CCBS)$

5.1.2.1.2d  CC-Establishment confirmed (U0.5) $(CCBS)$

5.1.2.1.2e  Recall present (U0.6) $(CCBS)$

5.1.2.1.3  Call initiated (U1)

5.1.2.1.4  Mobile originating call proceeding (U3)  Word‑p. 275

5.1.2.1.5  Call delivered (U4)

5.1.2.1.6  Call present (U6)

5.1.2.1.7  Call received (U7)

5.1.2.1.8  Connect Request (U8)

5.1.2.1.9  Mobile terminating call confirmed (U9)

5.1.2.1.10  Active (U10)

5.1.2.1.11  Disconnect request (U11)

5.1.2.1.12  Disconnect indication (U12)

5.1.2.1.13  Release request (U19)

5.1.2.1.14  Mobile originating modify (U26)

5.1.2.1.15  Mobile terminating modify (U27)

5.1.2.2  Network call states  Word‑p. 276

5.1.2.2.1  Null (State N0)

5.1.2.2.2  MM connection pending (N0.1)

5.1.2.2.2a  CC connection pending (N0.2) $(CCBS)$

5.1.2.2.2b  Network answer pending (N0.3) $(CCBS)$

5.1.2.2.2c  CC-Establishment present (N0.4) $(CCBS)$

5.1.2.2.2d  CC-Establishment confirmed (N0.5) $(CCBS)$

5.1.2.2.2e  Recall present (N0.6) $(CCBS)$ |R11|

5.1.2.2.3  Call initiated (N1)

5.1.2.2.4  Mobile originating call proceeding (N3)

5.1.2.2.5  Call delivered (N4)

5.1.2.2.6  Call present (N6)

5.1.2.2.7  Call received (N7)  Word‑p. 277

5.1.2.2.8  Connect request (N8)

5.1.2.2.9  Mobile terminating call confirmed (N9)

5.1.2.2.10  Active (N10)

5.1.2.2.11  Not used

5.1.2.2.12  Disconnect indication (N12)

5.1.2.2.13  Release request (N19)

5.1.2.2.14  Mobile originating modify (N26)

5.1.2.2.15  Mobile terminating modify (N27)

5.1.2.2.16  Connect Indication (N28)

5.2  Call establishment procedures

5.2.1  Mobile originating call establishment  Word‑p. 278

5.2.1.1  Call initiation  Word‑p. 279

5.2.1.2  Receipt of a setup message

5.2.1.3  Receipt of a CALL PROCEEDING message  Word‑p. 281

5.2.1.4  Notification of progressing mobile originated call

5.2.1.4.1  Notification of interworking in connection with mobile originated call establishment

5.2.1.4.2  Call progress in the PLMN/ISDN environment  Word‑p. 282

5.2.1.5  Alerting

5.2.1.6  Call connected

5.2.1.7  Call rejection  Word‑p. 283

5.2.1.8  Transit network selection

5.2.1.9  Traffic channel assignment at mobile originating call establishment

5.2.1.10  Call queuing at mobile originating call establishment  Word‑p. 284

5.2.1.11  Speech Codec Selection

5.2.1.12  Cellular Text telephone Modem (CTM) selection |R5|  Word‑p. 285

5.2.2  Mobile terminating call establishment

5.2.2.1  Call indication

5.2.2.2  Compatibility checking  Word‑p. 286

5.2.2.3  Call confirmation

5.2.2.3.1  Response to SETUP

5.2.2.3.2  Receipt of CALL CONFIRMED and ALERTING by the network  Word‑p. 287

5.2.2.3.3  Call failure procedures

5.2.2.3.4  Called mobile station clearing during mobile terminating call establishment  Word‑p. 288

5.2.2.4  Notification of interworking in connection with mobile terminating call establishment

5.2.2.5  Call accept

5.2.2.6  Active indication

5.2.2.7  Traffic channel assignment at mobile terminating call establishment  Word‑p. 289

5.2.2.8  Call queuing at mobile terminating call establishment

5.2.2.9  User connection attachment during a mobile terminating call

5.2.2.10  Speech Codec Selection  Word‑p. 290

5.2.2.11  Cellular Text telephone Modem (CTM) selection |R5|

5.2.3  Network initiated MO call $(CCBS)$

5.2.3.1  Initiation

5.2.3.2  CC-Establishment present

5.2.3.2.1  Recall Alignment Procedure  Word‑p. 291

5.2.3.3  CC-Establishment confirmation  Word‑p. 293

5.2.3.4  Recall present

5.2.3.5  Traffic channel assignment during network initiated mobile originating call establishment  Word‑p. 294

5.2.4  Call establishment for SRVCC or vSRVCC |R8|

5.2.4.1  General

5.2.4.2  Call activation for SRVCC

5.2.4.2a  Call activation for vSRVCC |R11|  Word‑p. 296

5.2.4.2b  Multimedia CAT and vSRVCC handover |R11|  Word‑p. 297

5.2.4.3  Traffic channel assignment and user connection attachment

5.2.4.4  State verification |R10|

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