User's Manual Part 2

Chapter 10 The VoIP Account Screens
BM2022w User’s Guide
174
time values. When the duration of the call reaches half of the SE time period, the session is
refreshed.
Table 78 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)