1、正常的呼叫拆线( CAUSE16)(亦即被叫侧未接通,但由被叫侧发起释放的情况) ISUP信令流程: 17:36:14.504.334 SUP IAM(4106812739->13900434331) 17:36:16.860.498 SUP ACM 17: 36: 28. 189.539 ISUP REL( Normal Call Clearing 17:3628.314.979 ISUP RLO 详细的信令见: 4106812739bt 相应的A+被叫流程为 +--------+--+--------+-----+ Long Time Last Prot Last MSG Calling Party +------+- -+-----+ 17:32:19650,122|DTAP PAGeS LAC=17217CELL=3351 1732:19,740,523SCC 1732:19.832,255DTAP 「TRCM 7:32:19.868994BSSM CLUP 732:20,106616BSSM ICLUPD 17:32:20,305,731|DTAP 「 TRCME 7:3220,890,139DIAP SETUP04106812739 7:32:21,248,222DIAP CONF 17:32:21,435,766BSSM ASREQ 7:32:22,220.84l1|BSSM JASCMP 173222,316,710DTAP ALERT 7:32:33662,375DTAP DISC Normal call clearing(BSC发给MSC) 1732:3,707,296DTAP ELEAS 1732:3,921,104DTAP 1732:3,967288BSSM CLCMD 7:32:34,382,985BSSM CLCMP 73234,420,520|SCCP RLSD 732:34,448483|SCCF RLC 详细A+流程见:4106812739ADt 从A接口的信令流程中我们可以看出:在正常的振铃开始后11秒左右,由BSC主动 发起了DISC消息,因此MSC向主叫侧(A局)发送了REL消息,并将这种呼叫计入了呼 损的范畴 这种CASE的另外一个信令流程略有不同: b)case 2 ISUP信令流程:1、 正常的呼叫拆线（CAUSE 16）(亦即被叫侧未接通，但由被叫侧发起释放的情况) a) case 1 ISUP 信令流程： 17:36:14.504.334 ISUP_IAM ( 4106812739 -> 13900434331 ) 17:36:16.860.498 ISUP_ACM 17:36:28.189.539 ISUP_REL ( Normal Call Clearing ) 17:36:28.314.979 ISUP_RLC 详细的信令见： 相应的 A+被叫流程为： +---------------------+------------+-------------------+---------------------+ |Long Time |Last Prot |Last MSG |Calling Party | +---------------------+------------+-------------------+---------------------+ |17:32:19,650,122 |DTAP |PAGRES LAC=17217 CELL=3351 |17:32:19,740,523 |SCCP |CC |17:32:19,832,255 |DTAP |TRCM |17:32:19,868,994 |BSSM |CLUP |17:32:20,106,616 |BSSM |CLUPD |17:32:20,305,731 |DTAP |TRCMP |17:32:20,890,139 |DTAP |SETUP |`04106812739` | |17:32:21,248,222 |DTAP |CCONF |17:32:21,435,766 |BSSM |ASREQ |17:32:22,220,841 |BSSM |ASCMP |17:32:22,316,710 |DTAP |ALERT |17:32:33,662,375 |DTAP |DISC Normal call clearing (BSC 发给 MSC) |17:32:33,707,296 |DTAP |RELEAS |17:32:33,921,104 |DTAP |RELCMP |17:32:33,967,288 |BSSM |CLCMD |17:32:34,382,985 |BSSM |CLCMP |17:32:34,420,520 |SCCP |RLSD |17:32:34,448,483 |SCCP |RLC 详细 A+流程见: 从 A 接口的信令流程中我们可以看出：在正常的振铃开始后 11 秒左右，由 BSC 主动 发起了 DISC 消息，因此 MSC 向主叫侧（A 局）发送了 REL 消息，并将这种呼叫计入了呼 损的范畴。 这种 CASE 的另外一个信令流程略有不同： b) case 2 ISUP 信令流程：