Successful Call Setup And Disconnect - Yealink SIP-T54S Administrator's Manual

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
SIP 5xx—Server Failure Responses
SIP 6xx—Global Failures Responses
For more information on SIP Responses, refer to

Successful Call Setup and Disconnect

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:
User A calls User B.
1.
User B answers the call.
2.
User B hangs up.
3.
User A
Step
F1 INVITE—User A to Proxy Server
1062
Proxy Server
F1. INVITE B
F4. 100 Trying
F6. 180 Ringing
F8. 200 OK
F9. ACK
2-way RTP channel established
F12. BYE
F13. 200 OK
Action
SIP Responses on page 1058.
F2. INVITE B
F3. 100 Trying
F5. 180 Ringing
F7. 200 OK
F10. ACK
F11. BYE
F14. 200 OK
Description
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

User B