6.2.2 300呼叫
300呼叫流程除应答信号外同6.2.1。下面补充连续呼叫的信号流程(以SSP设在长途局为例,见图41)。
6.2.3 虚拟专用网呼叫
虚拟专用网呼叫的信号流程同6.2.1,下面仅补充无应答转移的信号流程(见图42)。
PABX LS SSP SCP TS LS PABX
|6 | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|0 | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|0 | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|N1 | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|N2 | | | | | |
|-------→| | | | | |
|A6 | | | | | |
|←-------| | | | | |
|KA | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|P′ | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|∶ | | | | | |
|D′ | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|15 | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|(N) | | | | | |
|-------→| | | | | |
|A1 | | | | | |
|←-------| | | | | |
|∶ | | | | | |
|A1 | | | | | |
|←-------|等4-6S | | | | |
| |(A) | | | | |
| |---------→|IDP | | | |
| | |--------→| | | |
| | |IRB.CON | | | |
| | |←--------| | | |
| | | |IAM |IAM | |
| | |---------|--------→|--------→|P |
| | | | | |-------→|
| | | | | |A1 |
| | | | | |←-------|
| | | | | |¨ |
| | | | | |D |
| | | | | |-------→|
|A3 |ACM | |ACM |ACM |A3 |
|←-------|←---------|←--------|---------|←--------|←-------|
|KD | | | | | |
|←-------| | | | | |
|KB | |ACR ERB | | | |
|←-------| |--------→| | | |
| |给用户录音通知请稍候|CTR P&C | | | |
| | |←--------| | | |
| | |CDM | | | |
| | |←--------| | | |
| | | |IAM |IAM | |
| | |---------|--------→|--------→|P |
| | | | | |-------→|
| | | | | |A1 |
| | | | | |←-------|
| | | | | |D |
| | | | | |-------→|
| | | | | |A3 |
| | | | | |←-------|
| | | |ACM |ACM |KD |
| | |←--------|---------|←--------|-------→|
| | | | | |KB |
| | | | | |←-------|
|应答 |CON | |ANN |ANN |应答 |
|←-------|←---------|←--------|---------|←--------|←-------|
|拆线 |CLF |CLF |CLF | |拆线 |
|-------→|---------→|--------→|---------|--------→|-------→|
| | |ACR | | | |
| | |--------→| | | |
|释放监护 |RLG |RLG | |RLG |释放监护 |
|←-------|←---------|←--------|←--------|---------|←-------|
| | | | | | |
| | | | | | |
图42 虚拟专用网呼叫(有一次无应答呼叫前转)