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--- Is it an Interoperability problem or a config problem (http://www1.pbxes.com/forum/threadid.php?threadid=1314942505)

Is it an Interoperability problem or a config problem

When I call a classic extension from another extension using OVH.net outbound trunk, it works well but when I receive a call through another trunk, the classic extension rings correctly but I have no sound at all. The call monitor shows me that OVH trunk is correctly used.
If I use ippi.fr as the outbound trunk it is working correctly.
I do not understand why OVH can correctly connect me directly but doesn't work when somebody calls from outside.
Am I having a config problem or an interoperability problem.