[Asterisk-Users] Cisco 7940 no audio

[Tracy R Reed]

On Fri, Apr 16, 2004 at 06:04:04PM +0100, Craig Waddington spake thusly:
> When we receive or make a call to the outside - they can hear us, but we
> cant hear them.

I have had this problem several times and so far no resolution. However
for me it has always been with IAX. I have been told that IAX is supposed
to be NAT-safe but that does not seem to be the case for me. For example:

SIP (grandstream, snom) ->Asterisk->NAT->Asterisk->SIP (grandstream, snom)

He can hear me but I can't hear him.

In another case I had:

IAXclient (soft phone)->NAT->Asterisk->Snom

And I could hear him but he could not hear me. Same phone system and
settings as above.

However as soon as I switched the first users phone to talk directly to my
Asterisk box with SIP it worked perfectly. And when I switched the user in
the second case to a SIP based soft phone it also worked just fine. SIP
has worked better through NAT than IAX (with nat=yes in sip.conf) which is
bizarre and contrary to what I have read where IAX should be NAT-safe and
SIP not.

I have dreams of a world fully converted to IPv6 where NAT no longer
exists. Alas, it is but a dream.

-- 
Tracy Reed                     The attachment is a digital signature.
http://copilotconsulting.com   More info: http://copilotconsulting.com/sig
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