Call Hold
Place a call on hold by pressing the “flash” button on the analog phone (if the phone has that
button).Press the “flash” button again to release the previously held Caller and resume
conversation. If no “flash” button is available, use “hook flash” (toggle on-off hook quickly). You
may drop a call using hook flash.
Call Waiting
Call waiting tone (3 short beeps) indicates an incoming call, if the call waiting feature is enabled.
Toggle between incoming call and current call by pressing the “flash” button. First call is placed
on hold. Press the “flash” button to toggle between two active calls.
Call Transfer
Blind Transfer
Blind transfer used to transfer call to the third party without inform caller. Assume that call
Caller A and B are in conversation. A wants to Blind Transfer B to C:
Caller A presses FLASH on the analog phone to hear the dial tone;
Caller A dials *87 then dials caller C’s number, and then # (or wait for 4 seconds);
Caller A will hear the confirm tone. Then, A can hang up.
Note：
“Call features enable” must be set to “Yes” in web configuration page. Caller A can place a
call on hold and wait for one of three situations:
A quick confirmation tone (similar to call waiting tone) followed by a dial-tone. This
indicates the transfer is successful. At this point, Caller A can either hand up or make
another call.
A quick busy tone followed by a restored call (on supported platforms only). This
means the transferee has received a 4xx response for the INVITE and we will try to
recover the call. The busy tone is just to indicate to the transferor that the transfer
has failed.
Continuous busy tone. The phone has timed out.
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