Panasonic hybrid ip-pbx kx-tda200 User Manual

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Operation
User Manual
31
 To cancel
 Sending a call waiting tone (Busy Station Signalling [BSS])
You can inform the called party that your call is waiting.
If you do not answer within a specified time period, this feature will be cancelled.
Availability of this feature depends on the ISDN service of your telephone company.
Depending on the other party's telephone, the "Off-Hook Call Announcement (OHCA)" 
and the "Whisper OHCA" functions can be applied. You can talk to the other party through 
the speaker and the microphone (OHCA) or you only send a call announcement through 
the handset (Whisper OHCA), while they are having another conversation using the 
handset.
Refer to "1.7.3
PT and SLT
PT/SLT/PS
Off-hook.
On-hook.
C.Tone   
6
4
Enter    46
PT/SLT/PS
Enter 1.
1
While hearing a busy tone