Call From A Cisco Sip Ip Phone To A Cisco Sip Ip Phone Using A Sip Backup Proxy - Cisco 7960G Administrator's Manual
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Also See for 7960G:
- Administration manual (184 pages) ,
- User manual (122 pages) ,
- Phone manual (74 pages)
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Call Flow Scenarios for Successful Calls
Call from a Cisco SIP IP Phone to a Cisco SIP IP Phone Using a SIP Backup Proxy
Figure B-16
backup proxy.
Figure B-16 A Successful Call from a Cisco SIP IP Phone to a Cisco SIP IP Phone Using a SIP Backup
SIP IP Phone
User A
Step
Action
1.
INVITE—Cisco SIP IP phone
(A) to primary proxy
INVITE—Cisco SIP IP phone
2.
(A) to primary proxy (second
try)
INVITE—Cisco SIP IP phone
3.
(A) to primary proxy (third try)
Cisco SIP IP Phone Administrator Guide, Release 6.x and 7.x
B-44
illustrates a successful call from a Cisco SIP IP phone to a Cisco SIP IP phone that uses a SIP
Proxy
Primary Proxy
IP
1. INVITE
2. INVITE (retry)
3. INVITE (retry)
4. INVITE (retry)
5. INVITE (retry)
6. INVITE (retry)
7. INVITE (retry)
8. INVITE (retry)
9. 100 Trying
13. 180 Ringing
15. 200 OK
16. ACK
18. BYE
21. 200 OK
Description
The phone tries to connect to the primary proxy by sending out the INVITE
message.
The phone retries a second time to connect to the primary proxy by sending out
the INVITE message.
The phone retries a third time to connect to the primary proxy by sending out the
INVITE message.
Backup Proxy
10. INVITE
11. 100 Trying
12. 180 Ringing
14. 200 OK
17. ACK
2-way voice path
19. BYE
20. 200 OK
Appendix B
SIP Call Flows
SIP IP Phone
User B
IP
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