I have the phone model shown in the attached photo, and I’m having trouble using the ‘R’ (Recall) button to transfer calls to other extensions. Between the phone and FreePBX, I have a Cisco SPA 122 adapter. All other buttons, including * and #, work fine. Any advice on resolving this would be appreciated! Apologies if I posted in the wrong section.
Thanks
This type of button was used to send a calibrated cut (In France, 170 or 270ms if I remember correctly) to generate a transfer.
Example: You are in communication with someone and you need to transfer the call to another extension, you then press R and dial the destination number and hangup call or repress on R to talk with the first call.
This type of button was used with pulse dialing.
It’s no longer used with DTMFdialing.
Anyway, if you press on R, no tone you will hear, but just a clip.
Same thing @david55 
Do this only if you can’t get hookflash working properly; DTMF transfers often interfere with other uses of in-call DTMF, and have security issues if not properly configured.
Can you transfer a call by momentarily depressing the hookswitch for ~0.5 seconds? If not, what happens? Have you checked these settings in the SPA: Hook Flash Timer Min, Hook Flash Timer Max, Blind Attn-Xfer Enable, Xfer When Hangup Conf?
If yes, use that if you can’t get the buttons to work. While on a call, what happens when you press R? When you press RP?
Not true. In
see the hook flash settings on p. 74 and the transfer-related settings on p.89.
A hook flash can answer call waiting, or switch between calls when call waiting is active.
Otherwise, a hook flash can be used to place a call on hold, or to initiate a transfer or three-way conference. For any of these functions, Asterisk doesn’t see anything special, only hold and REFER requests.
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