Samsung Ubigate iBG2016 Configuration Manual page 405

SIP Gateway to SIP Gateway-Call via Proxy Server
Figure 28.9 shows the call of SIP Gateway to SIP Gateway using SIP Proxy
server. Table28.3 briefly describes the messages used in the call flow.
User A PBX A
1. Setup
3. Call
Proceeding
12. Alerting
1-way Voice Path 2-way RTP channel
16. Connect
17. Connect ACK
2-way Voice Path 2-way RTP channel
24. Disconnect
26. Release
30. Release
Complete
Figure 3.9 SIP Gateway-to-SIP Gateway-Call via SIP Proxy Server with
© SAMSUNG Electronics Co., Ltd.
Proxy Server
GW1
2. INVITE
4. INVITE
5. 100 Trying
7. 100 Trying
10. 180 Ringing
11. 180 Ringing
14. 200 OK
15. 200 OK
18. ACK
19. ACK
22. BYE
23. BYE
27. 200 OK
28. 200 OK
Record Route Enabled
Ubigate iBG2016 Configuration Guide/Ed.00
GW2
IP Network
6. Setup
8. Call
Proceeding
9. Alerting
1-way Voice Path
13. Connect
20. Connect
ACK
2-way Voice Path
21. Disconnect
25. Release
29. Release
Complete
User B
PBX B
351