LS SSP SCP TS TS LS
8
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| 0 | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| 0 | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| K | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| N1 | | | | |
|----------→| | | | |
| A6 | | | | |
|←----------| | | | |
| KA | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| P′ | | | | |
|----------→| | | | |
| ∶ | | | | |
| D′ | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| 15 | | | | |
|----------→| | | | |
| A1 | | | | |
|←----------| | | | |
| N2 | | | | |
|----------→| | | | |
| ∶ | | | | |
| D | | | | |
|----------→| | | | |
| A3 | | | | |
|←----------| | | | |
| KD | | | | |
|----------→| | | | |
| KB | | | | |
|←----------| IDP | | | |
| |------------------→| | | |
| | ∶ | | | |
| | RRB.CON | | | |
| |←------------------| | | |
| | 0 | | |
| |---------------→| | |
| | A1 | | |
| |←---------------| | |
| | X1 | | |
| |---------------→| | |
| | A1 | | |
| |←---------------| | |
| | X2 | | |
| |---------------→| | |
| | A1 | |
| |←---------------- | |
| | P | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| |
| | 0 | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| |
| | ∶ | |
| | D | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| P |
| | |---------→|
| | | A1 |
| | |←---------|
| | | Q |
| | |---------→|
| | | A1 |
| | |←---------|
| | | ∶ |
| | | D |
| | |---------→|
| | A3′ | A3 |
| |←-----------------------|←---------|
| | KD | KD |
| |-----------------------→|---------→|
| | KB(=2) | KB(=2) |
| |←-----------------------|←---------|
| | ACR | |
| |--------------------→| | | |
| | ERB | | | |
|向用户送录音通知请稍候|--------------------→| | | |
|←----------| ∶ | | | |
| | CON | | | |
| |←--------------------| | | |
| | 0 | | |
| |---------------→| | |
| | A1 | | |
| |←---------------| | |
| | X1 | | |
| |---------------→| | |
| | A1 | | |
| |←---------------| | |
| | X2 | | |
| |---------------→| | |
| | A1 | | |
| |←---------------| | |
| | P1 | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| |
| | Q1 | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| |
| | ∶ | |
| | D1 | |
| |-----------------------→| |
| | A1 | |
| |←-----------------------| P1 |
| | |---------→|
| | | A1 |
| | |←---------|
| | | Q1 |
| | |---------→|
| | | A1 |
| | |←---------|
| | | ∶ |
| | | D1 |
| | |---------→|
| | A3′ | A3 |
| |←-----------------------|←---------|
| | KD | KD |
| |-----------------------→|---------→|
| | KB(=1) | KB(=1) |
| |←-----------------------|←---------|
| 应答 | 应答 | 应答 | 应答 |
|←----------|←------------|←---------|←---------|
| 挂机 | 挂机 | 挂机 | 挂机 |
|←----------|←------------|←---------|←---------|
| 拆线 | 拆线 | 拆线 | 拆线 |
|----------→|------------→|---------→|---------→|
| 释放监护 | 释放监护 | 释放监护 | 释放监护 |
|←----------|←------------|←---------|←---------|
| | ACR | |
| |------------------→| | |
图29 固定用户呼叫800用户(SSP设在长途局)
(呼叫前转一次,通话结束,被叫先挂机)