ZyXEL Communications MAX208M - Page 168

Chapter 10 The VoIP Account Screens
WiMAX Device Configuration User’s Guide
168
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)