C-27

SIP Phone to Phone via Gateway: Called Party is Busy
Figure C-11. Call Flow Diagram: SIP Phone to Phone: Called Party is Busy — 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. 183
11. 183
12. 183
13. 200
14. 200
15. 200