Typical ISUP message flows

The following examples have been collected using the ss7-view –message option:

Successful outbound with answer

11:36:18.978:0381:                                             <<---------- SL_CALL_SETUP_REQ
11:36:18.979:0381:              <<---------- IAM/ISUP_SETUP[624185]
11:36:19.000:0381:          ACM/ISUP_PROCEED ---------->>
.......
11:36:20.150:0381:          ANM/ISUP_SETUP ---------->>
11:36:20.150:0381:                           SL_CALL_SETUP_CNF [SL_REPLY_SUCCESS] ---------->>
.......
11:36:24.344:0381:                                             <<---------- SL_CALL_TERMINATE_REQ
11:36:24.345:0381:              <<---------- REL/ISUP_RELEASE[Cause:CSV_NORMALCALLCLR]
11:36:24.362:0381:          RLC/ISUP_RELEASE ---------->>
11:36:24.362:0381:                           SL_CALL_TERMINATE_CNF [SL_REPLY_SUCCESS] ---------->>

Failed outbound call – no response from far end (D7 terminates call)

11:34:40.705:0383:                                             <<---------- SL_CALL_SETUP_REQ
11:34:40.705:0383:              <<---------- IAM/ISUP_SETUP[624185]
.......
11:35:10.708:0383:          REL/ISUP_RELEASE[Cause:CSV_NOUSERRESP]  ---------->>
11:35:10.708:0383:                           SL_CALL_SETUP_CNF [SL_REPLY_NO_ANSWER] ---------->>
11:35:10.723:0383:          RLC/ISUP_RELEASE ---------->>

Failed outbound call – user busy

15:17:55.661:0383:                                             <<---------- SL_CALL_SETUP_REQ
15:17:55.662:0383:              <<---------- IAM/ISUP_SETUP[624185]
15:17:55.685:0383:          ACM/ISUP_PROCEED ---------->>
.......
15:17:57.072:0383:          REL/ISUP_RELEASE[Cause:CSV_USERBUSY]  ---------->>
15:17:57.072:0383:                           SL_CALL_SETUP_CNF [SL_REPLY_NO_ANSWER] ---------->>

Successful inbound call (T1)

15:28:05.089:0001:          IAM/ISUP_SETUP[822327612]  ---------->>
15:28:05.090:0001:                           SL_CALL_SETUP_IND ---------->>
15:28:05.090:0001:              <<---------- ACM/ISUP_OGC_SELECTED
15:28:05.090:0001:              <<---------- ACM/ISUP_ALERT
15:28:05.094:0001:                                             <<---------- SL_CALL_ANSWER_REQ
15:28:05.094:0001:                           SL_CALL_ANSWER_CNF [SL_REPLY_SUCCESS] ---------->>
15:28:05.094:0001:              <<---------- ANM/ISUP_SETUP
.......
15:28:08.080:0001:          REL/ISUP_RELEASE[Cause:CSV_NORMALCALLCLR]  ---------->>
15:28:08.081:0001:                           SL_CALL_DISCONNECT_IND ---------->>
15:28:08.081:0001:                           SL_CALL_TERMINATE_IND ---------->>

Blueworx Voice Response quiescing a circuit (No active call)

15:29:48.596:0000:                                             <<---------- SL_CHANNEL_QUIESCE_REQ
15:29:48.597:0000:              <<---------- BLO/ISUP_BLOCKING
15:29:48.613:0000:          BLA/ISUP_BLOCKING ---------->>
15:29:48.613:0000:                           SL_CHANNEL_QUIESCE_CNF ---------->>

Outbound Call with suspend

15:38:46.938:0383:                                             <<---------- SL_CALL_SETUP_REQ
15:38:46.938:0383:              <<---------- IAM/ISUP_SETUP[624185]
15:38:46.960:0383:          ACM/ISUP_PROCEED ---------->>
.......
15:38:48.047:0383:          ANM/ISUP_SETUP ---------->>
15:38:48.047:0383:                           SL_CALL_SETUP_CNF [SL_REPLY_SUCCESS] ---------->>
.......
15:38:50.078:0383:          SUS/ISUP_SUSPEND ---------->>
.......
15:38:52.269:0383:                                             <<---------- SL_CALL_TERMINATE_REQ
.......
15:39:20.070:0383:          RES/ISUP_RESUME ---------->>
15:39:20.070:0383:              <<---------- REL/ISUP_RELEASE[Cause:CSV_NORMALCALLCLR]
15:39:20.086:0383:          RLC/ISUP_RELEASE ---------->>
15:39:20.087:0383:                           SL_CALL_TERMINATE_CNF [SL_REPLY_SUCCESS] ---------->>

Quiescing a circuit with active call

15:53:06.953:0381:                                             <<---------- SL_CALL_SETUP_REQ
15:53:06.953:0381:              <<---------- IAM/ISUP_SETUP[624185]
15:53:06.976:0381:          ACM/ISUP_PROCEED ---------->>
15:53:07.041:0381:          ANM/ISUP_SETUP ---------->>
15:53:07.041:0381:                           SL_CALL_SETUP_CNF [SL_REPLY_SUCCESS] ---------->>
.......
15:53:11.835:0381:                                             <<---------- SL_CHANNEL_QUIESCE_REQ
15:53:11.835:0381:              <<---------- BLO/ISUP_BLOCKING
15:53:11.851:0381:          BLA/ISUP_BLOCKING ---------->>
.......
15:53:37.130:0381:                                             <<---------- SL_CALL_TERMINATE_REQ
15:53:37.130:0381:              <<---------- REL/ISUP_RELEASE[Cause:CSV_NORMALCALLCLR]
15:53:37.146:0381:          RLC/ISUP_RELEASE ---------->>
15:53:37.146:0381:                           SL_CALL_TERMINATE_CNF [SL_REPLY_SUCCESS] ---------->>
15:53:37.146:0381:                           SL_CHANNEL_QUIESCE_CNF ---------->>