I have several IAX2 extensions in a Asterisk 1.6.2 PBX.
I’ve noticed that if a call from those IAX2 extensions is placed though a SIP trunk there’s no ringback tone. That’s the only problem, the call is answered, the callee hears the ring sound, the communication is perfect. It’s just that there is no ringback tone in the meanwhile. The problem is reproducible either with local and remote extension, and either with hardphone (Atcom 610-R) and softphone (Zoiper) iax extensions
This just happens if the call is placed through a SIP trunk. When the call is to another extension (SIP or IAX) every thing is OK. If the call goes through the ISDN trunk everything is right.
Notice that if the call is originated in a SIP extension and goes through the same trunk, then the ringback tone sounds rightly; just happens if the caller uses one of the IAX2 extensions.
I believe that this is a real problem for the users of those extensions, because the caller isn’t able to know if the call is ringing in the callee end; and the situation goes worse if the callee takes long to answer
I’ll be very thankful if anyone can give me hints to debug this nasty problem
Thanks in advance