3. In the dialog box prompting "Call Completion. Wait xxx" (xxx is the phone number of B):
(1) If you click Exit, the test telephone set exits the screen prompting "Call Completion. Wait
xxx" and returns to the standby screen. When B ends the call or is idle, the test telephone set
does not display the message "Call Completion. Call xxx".
(2) If you click OK, there are two cases:
a) If B is already in a call, the test telephone set calls B, and B rejects the call, the test telephone
set exits the screen prompting "Call Completion. Wait xxx" and returns to the standby screen.
When B ends the call, the test telephone set displays the message "Call Completion. Call xxx"
(xxx indicates the phone number of B) in about 30s.
b) If B is idle, the test telephone set calls B, and B rejects the call and returns to the idle state, the
test telephone set exits the screen prompting "Call Completion. Wait xxx" and soon displays the
message "Call Completion. Call xxx" (xxx indicates the phone number of B), as shown in the
following figure.
Click Exit. The test telephone set does not call B and returns to the standby screen.
Click OK and capture SIP packets. It is found that the peer telephone set sends NOTIFY,
indicating that it is in the terminated state. At this time, the test telephone set can call B again and
