Appendix
993
SIP 5xx—Server Failure Responses
SIP 6xx—Global Failures Responses
For more information on SIP Responses, refer to SIP Responses on page 989.
The following figure illustrates the scenario of a successful call. In this scenario, the two end
users are User A and User B. User A and User B are located at Yealink SIP IP phones.
The call flow scenario is as follows:
1. User A calls User B.
2. User B answers the call.
3. User B hangs up.
User A Proxy Server User B
F1. INVITE B
F2. INVITE B
F3. 100 Trying
F9. ACK
F10. ACK
F5. 180 Ringing
2-way RTP channel established
F8. 200 OK
F7. 200 OK
F6. 180 Ringing
F4. 100 Trying
F11. BYE
F12. BYE
F13. 200 OK
F14. 200 OK
INVITE—User A to Proxy Server
User A sends a SIP INVITE message to a
proxy server. The INVITE request is an
invitation to User B to participate in a call
session.
In the INVITE request:
The IP address of User B is inserted in
the Request-URI field.
User A is identified as the call session
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