Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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ACK—User A to Proxy Server
User A sends a SIP ACK to the proxy
server. The ACK confirms that User A has
received the 200 OK response. The call
session is now active.
ACK—Proxy Server to User B
The proxy server sends the SIP ACK to
User B. The ACK confirms that the proxy
server has received the 200 OK response.
The call session is now active.
BYE—User B to Proxy Server
User B terminates the call session by
sending a SIP BYE request to the proxy
server. The BYE request indicates that User
B wants to release the call.
BYE—Proxy Server to User A
The proxy server forwards the SIP BYE
request to User A to notify that User B
wants to release the call.
200 OK—User A to Proxy Server
User A sends a SIP 200 OK response to
the proxy server. The 200 OK response
indicates that User A has received the BYE
request. The call session is now
terminated.
200 OK—Proxy Server to User B
The proxy server forwards the SIP 200 OK
response to User B to indicate that User A
has received the BYE request. The call
session is now terminated.
Unsuccessful Call Setup—Called User is Busy
The following figure illustrates the scenario of an unsuccessful call caused by the called user’s
being busy. 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 is busy on the IP phone and unable or unwilling to take another call.
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