[asterisk-users] One way audio - doesn't seem to be NAT issue

[Michael Dupree]

Not 100% ure, but maybe play with the canreinvite or directmedia settings.

On Wed, Aug 12, 2015 at 3:10 AM, D'Arcy J.M. Cain <darcy at vex.net> wrote:

> I have been banging my head against the wall for weeks now on this
> one.  I have a switch running NetBSD and Asterisk 11.19.0 although I
> have had this problem on older versions as well.  I, and my users, can
> call out, we can receive calls, quality is excellent but I cannot talk
> with one user.  The different elements are as follows:
>
> The switch as described above which is in a server room on the Internet
> backbone with a public IP address.
>
> My home system which is behind a bridged modem through a Linksys
> WRT54GS with priority given to my ATA.  The ATA is a Cisco SPA112.  I
> also have an actual SIP phone.  The problem happens with both.
> Obviously I am using NAT but both devices work just fine if I am going
> to the PSTN.
>
> My user who is also going through a bridged modem to a Linksys SPA-2102
> which is doing the PPPOE so it has a public IP address and no NAT
> involved although it serves NAT for the connected computer.
>
> So here is the problem.  While both of us have no problems externally,
> when we call each other we get one way audio and it is always from me
> to him no matter who initiates the call.
>
> A further test, I can call from the SIP phone to the ATA connected
> phone and vice versa just fine.  That involves two devices behind the
> same NAT but since they still need to use the server as an intermediary
> I can't see how that would matter.
>
> Given that both of us can make and accept calls and the server is
> simply connecting two separate channels I can't see where the problem
> might lie.  Can anyone suggest a possible setup issue?
>
> I have tried so many things but I am willing to try them again.  Feel
> free to make any suggestion no matter how silly.  I really need to fix
> this.
>
> Cheers.
>
>
> --
> D'Arcy J.M. Cain
> System Administrator, Vex.Net
> http://www.Vex.Net/ IM:darcy at Vex.Net
> VoIP: sip:darcy at Vex.Net
>
> --
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-- 
Michael Dupree jr.
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