i have faced this problem with one of the major VoIP whole providers in India  
.. they have a new platform with Sonus switches.. which does not support 
sendrecv media attribute .. however a work around that may work for you .. is 
enabling re-invite on their peer.
let me know if this works out for you.


Tarek Sawah

Information Technology  Adviser

Integrated Digital Systems

CCNP, MCSE, RHCE, TELECOM

USA: +1 386 492 9993



> From: alexreca...@gmail.com
> Date: Wed, 28 Sep 2011 18:59:39 +0200
> To: asterisk-users@lists.digium.com
> Subject: Re: [asterisk-users] Receiving musinc on hold instead of ring
> 
> > this is related to your carrier's SIP messages as they are sending a
> > sendonly attribute instead of sendrecv (taking a wild guess here) your
> > asterisk will act as if the call was placed on hold thus the MOH butts in.
> > an sip debug log for a similar call will be more helpful?
> 
> Thanks for the answer Tarek! I will try to obtain a full SIP trace
> tonight. If the problem is indeed that the carrier is sending the
> sendonly attribute in the SDP instead of sendrecv, what can I do? Is
> there anything I can configure on my side?
> 
> Thanks again,
> 
> Alex
> 
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