Call Flow Scenarios For Failed Calls; Gateway-To-Cisco Sip Ip Phone-Called User Is Busy - Cisco 7960 Administrator's Manual

Call Flow Scenarios for Failed Calls

Call Flow Scenarios for Failed Calls
This section describes call flows for the following scenarios, which illustrate
unsuccessful calls:
Gateway-to-Cisco SIP IP Phone—Called User is Busy
Figure B-13 illustrates an unsuccessful call in which User A initiates a call to
User B but User B is on the phone and is unable or unwilling to take another call.
Figure B-13 Gateway-to-Cisco SIP IP Phone—Called User is Busy
User A
PBX A
1. Setup
3. Call Proceeding
6. Disconnect (Busy)
7. Release
9. Release Complete
Cisco SIP IP Phone 7960 Administrator Guide
B-58
• Gateway-to-Cisco SIP IP Phone—Called User is Busy, page B-58
Gateway-to-Cisco SIP IP Phone—Called User Does Not Answer, page B-60
•
• Gateway-to-Cisco SIP IP Phone—Client, Server, or Global Error, page B-63
• Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User is Busy, page B-66
Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User Does Not Answer,
•
page B-68
• Cisco SIP IP Phone-to-Cisco SIP IP Phone—Authentication Error, page B-70
GW1
2. INVITE
4. 100 Trying
5. 486 Busy Here
8. ACK
IP Network
Appendix B SIP Call Flows
SIP IP Phone
User B
IP
78-10497-02