Hi, I have been using Sangoma A102 card with wanpipe-3.5.28 and FS 1.2.8. At a couple of different customer sites, common issue reported is, when a call is made from external world (mobile/fixed line), although the destination extension rings, no ringback is heard at the caller end. Extension dialplan is to bridge to the desired extension, something like: <action application="bridge" data="user/3001" /> On capturing the isdn traces, I see that packet exchanges involve SETUP, CALL PROCEEDING, and ALERTING (with a progress indicator saying "Call is not end-to-end ISDN - progress information available in-band") After experimenting a bit, what I find is, ringback is heard if I were to modify my dialplan as follows: <action application="ring_ready" /> <action application="set" data="ringback=$${uk-ring}"/> <action application="bridge" data="user/3001" /> This time, ISDN traces have the following: SETUP, CALL PROCEEDING, ALERTING (with a progress indicator saying "Call is not end-to-end ISDN - progress information available in-band"), and PROGRESS (with a progress indicator saying "In-band information or an appropriate pattern is now available") My question is, while working with FreeTDM, do I need to always set ringback explicitly? Could somebody please help me understand this correctly? Thanks!