There are 2 possibilities to enable distinctive ring on the Gigaset T300/T500. In the Gigaset T300/T500 you can enable distinctive ringing by changing the Manual configuration of the line settings, like the example below. Here we added the line: exten => _.,3,SIPAddHeader(Alert-Info: <http://127.0.0.1>\;info=alert-external) This causes that for every incoming external call, the Alert-Info header is added and the device now can react on this using a special ringtone. How to work with groups you can see below. We changed the incoming dialplan so that when a call for the group with number: 31859020520 is coming in, the Alert-Info field is changed to alert-group. [X2COM-incoming] exten => 31859020520,1,Set(channelname=X2COM-incoming) exten => 31859020520,2,Set(lineconfigid=1946) exten => 31859020520,3,SIPAddHeader(Alert-Info: <http://127.0.0.1>\;info=alert-group) exten => 31859020520,4,Goto(X2COM-incoming-manuell,${EXTEN},1) exten => _.,1,Set(channelname=X2COM-incoming) exten => _.,2,Set(lineconfigid=1946) exten => _.,3,SIPAddHeader(Alert-Info: <http://127.0.0.1>\;info=alert-external) exten => _.,4,Goto(X2COM-incoming-manuell,${EXTEN},1) [X2COM-incoming-manuell] exten => _X.,1,Goto(incoming,${EXTEN},1) exten => _+X.,1,Goto(incoming,${EXTEN},1) |