I'm trying to set up a dial group using an IP phone (Grandstream GXP 2020) and a phone via Handy-Tone 386, but there seems to be an issue with the Handy-tone. Routing a DID directly to either extension works without a hitch, and both phones ring using the following dial group: <extension name="group_dial_test"> <condition field="destination_number" expression="^2000$"> <action application="set" data="hangup_after_bridge=true"/> <action application="bridge" data="group/test@${domain_name}"/> </condition> </extension> Incidentally, I've also seen the following syntax, is there a difference? <action application="bridge" data="${group_call(test@${domain_name}+A)}"/> The only problem is that when the call is answered by the phone connected to the Handy-Tone FXS port, neither end has audio. The GXP 2020 works in all cases.