C-76

User Agent to User Agent: Call Waiting
Figure C-26. User Agent to User Agent: Call Waiting — Diagram 1
VOCAL User Agent UA Marshal
1. INVITE
2. 100
Redirect Server
3. INVITE
4. 302
5. ACK
6. INVITE
7. 302
8. ACK
VOCAL User Agent
9. INVITE
10. 180
11. 180
12. 200
13. 200
14. ACK
15. ACK
VOCAL User Agent