信令网_gsm主叫信令流程图_被叫信令(13)

指配请求与指配完成应答，给被叫用户分配话音信道.

13 Call Connect Success 18:52:20.729

Status: Accessed to a dedicated traffic channel

Phone Number: n/a

Time From Attempt: 1

BSIC: 37 RX Level Full: -58

Carrier: 94 RX Level Sub: -58

Attempted Time Slot: 4 RX Quality Full: n/a

Timing Advance: n/a RX Quality Sub: n/a

Local Area Code: 14101 MS Power: n/a

Cell ID: 41101

14 Layer 3 Uplink 18:52:20.828 FACCH ALERTING（MS-BTS-BSC）

当MSC收到呼叫核准消息后,将向BSC发出指配请求,给被叫用户分配话音信道.支配过程完成后,,被叫移动台将向网络发出待命ALERTING消息,此时被叫移动台将出现振铃提示,.MSC收到该指示后,向主叫方发出地址完成消息ACM,主叫端收到改消息后,也将以回铃音的方式提示主叫用户.

15 Call Connect Success 18:52:20.828

Status: Alerting

Phone Number: n/a

Time From Attempt: 1

BSIC: 37 RX Level Full: -58

Carrier: 94 RX Level Sub: -58

Attempted Time Slot: 4 RX Quality Full: n/a

Timing Advance: n/a RX Quality Sub: n/a

Local Area Code: 14101 MS Power: n/a

Cell ID: 41101

16 Layer 3 Uplink 18:52:20.907 FACCH CONNECT

被叫用户听到振铃作出应答后,将发送给MSC接通CONNECT消息,MSC再收到此消息后,接通全部链路,用户端到端传输全部建立.

17 Layer 3 Downlink 18:52:21.048 FACCH CONNECT ACKNOWLEDGE

按照集团公司测试规范,此时属于正式接通.

18 Layer 3 Downlink 18:54:07.660 FACCH DISCONNECT

由于是主叫挂机，系统通知被叫拆线。

Cause (16): Normal call clearing

19 Layer 2 Uplink 18:54:07.664 FACCH RR-RESP

20 Layer 2 Uplink 18:54:07.731 FACCH I-CMD

21 Layer 3 Uplink 18:54:07.731 FACCH RELEASE

但此时呼叫并未完全结束，系统与移动台之间需要保持一定的任务，如送收费指示等。当系统认为与移动台之间的连接已无必要时，被叫移动台向系统发出release消息.

22 Call Disconnect 18:54:07.731

TOM注释，

Status:Normal disconnect

Phone Number: n/a

Time From Attempt: 108

CC Cause: 16

23 Layer 3 Downlink 18:54:07.858 FACCH RELEASE COMPLETE

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