
Chapter 10 The VoIP Account Screens
uses proxy server P. Messages include Session Expiry (SE) and Minimum Session Expiry (MSE) time values. When the duration of the call reaches half of the SE time period, the session is refreshed.
Table 76 SIP Call Progression
A |
| P | B |
1. INVITE |
|
|
|
SE: 60 |
|
|
|
> |
|
| |
|
|
|
|
|
| 2. 422 |
|
|
| MSE: 3600 |
|
|
|
| |
|
|
|
|
3. ACK |
|
|
|
> |
|
| |
|
|
|
|
4. INVITE |
|
|
|
SE: 3600 |
|
|
|
MSE: 3600 |
|
|
|
> |
|
| |
|
|
|
|
|
| 5. INVITE |
|
|
| SE: 3600 |
|
|
| MSE: 3600 |
|
|
|
| |
|
|
|
|
|
|
| 6. INVITE |
|
|
| SE: 3600 |
|
|
| MSE: 3600 |
|
|
| |
|
|
|
|
|
|
| 7. OK |
|
|
| SE: 3600 |
|
|
| |
|
|
|
|
|
| 8. OK |
|
|
| SE: 3600 |
|
|
|
| |
|
|
|
|
9. OK |
|
|
|
SE: 3600 |
|
|
|
|
| ||
|
|
|
|
10. ACK |
|
|
|
> |
|
| |
|
|
|
|
|
| 11. ACK |
|
|
| ||
|
|
|
|
|
| 12. Dialogue (voice traffic) |
|
|
|
|
|
168 |
|
WiMAX Device Configuration User’s Guide | |
|
|