C-17

SIP IP Phone to Analog Phone via Gateway
Figure C-8. Call Flow Diagram: SIP IP Phone to SIP IP Phone via SIP Gateway — Diagram 1
SIP Phone UA Marshal
1. INVITE
2. 100
Redirect Server
3. INVITE
4. 302
5. ACK
5300 Marshal
6. INVITE
7. 100
Cisco 5300
8. INVITE
9. 100
10. 180
11. 180
12. 180
13. 200
14. 200
15. 200