Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
1062
SIP 5xx—Server Failure Responses
SIP 6xx—Global Failures Responses
For more information on SIP Responses, refer to SIP Responses on page 1058.
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:
1. User A calls User B.
2. User B answers the call.
3. User B hangs up.
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
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