[asterisk-users] Bad Voice Quality - IAX2 redirect

[Andrew Joakimsen]

I have seen countless problems resolved by using "notransfer=yes" in
IAX.conf stuff like dropped calls, poor quality and even 1 way audio.

On 11/28/06, hugolivude <hugolivude at gmail.com> wrote:
>
> Asterisk 1.2.7
> RedHat 9.0
>
> Hi,
> I've run into some voice degradation problems with IAX2:
>
> I frequently have calls come in on a DiD provided by an ITSP.  I often
> have to redirect these calls back out to the PSTN (i.e. to a cell
> phone).  When this happens,  I don't want my server in the media path,
> I want to hand it off to my ITSP instead and let them handle both ends
> of the call.  I've been very careful to avoid using t or T in my dial
> commands.
>
> I couldn't get this to work with SIP (I'm behind a NAT BTW).  No
> matter how I tried, the media continued to pass through my server, so
> I switched from SIP to IAX2.
>
> I've had much better success redirecting calls back to the PSTN using
> IAX2.  I can see the handshakes in the CLI and once the redirected
> call had been established, I can phyically disconnect my * server from
> the Ethernet and the call is unaffected.
>
> Unfortunately I'm getting complaints about call quality (I use ulaw
> the whole way).
>
> I don't think the problem can possibly be on my server or its
> configuration given that the call is completly handed off as described
> above.  Surely this must be the ITSP's problem, but perhaps I'm
> missing something?  Any suggestions are welcome!
>
> Thanks,
> H
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