Aastra 55i IP Phone - Play Call Waiting Tone

Model 55i IP Phone User Guide 149
Managing Calls
5. Click to save the Call Forward settings. The changes are dynamic and
are immediately applied to the phone.
The following example shows the idle screen on the IP Phone with Call Forwarding
set to "No Answer" mode.
L1
John Smith
CFWD NoAnswer
Sat Jan 1 01:04