Samsung Ubigate iBG3026 Configuration Manual page 390

CHAPTER 28. SIP Gateway Management
SIP Gateway to SIP Gateway-Call via Redirect Server
Figure 28.8 shows the call of SIP Gateway to SIP Gateway using SIP Redirect
server. Table 28.2 briefly describes the messages used in the call flow.
User A PBX A
1. Setup
7. Call
Proceeding
12. Alerting
1-way Voice Path
15. Connect
16. Connect ACK
2-way Voice Path
21. Disconnect
23. Release
26. Release
Complete
Figure 28.8 SIP Gateway-to-SIP Gateway-Call Via SIP Redirect Server
348
GW1 RS
2. INVITE
3. 300 Multiple Choice
4. ACK
5. INVITE
8. 100 Trying
11. 180 Ringing
2-way RTP channel
14. 200 OK
17. ACK
2-way RTP channel
20. BYE
24. 200 OK
GW2
IP Network
6. Setup
9. Call
10. Alerting
1-way Voice Path
13. Connect
18. Connect ACK
2-way Voice Path
19. Disconnect
22. Release
25. Release
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User B
PBX B
Proceeding
Complete