Asterisk Beep on Attended Transfer

Asterisk can produce a beep sound when doing a DTMF attended transfer by setting the relevant options in features.conf

But if you use the SIP phones transfer feature buttons, the default is that there is no beep tone.

If you want to produce a beep tone when the transfer is completed using the feature keys, Asterisk has a relatively hidden option for that.

Set theĀ ATTENDED_TRANSFER_COMPLETE_SOUND channel variable to ‘beep’ prior to dialling and that will cause the recipient to hear a beep tone.