[Asterisk-Users] TDM-400P Sound Quality issues

[Paul Fielding]

I'm running a TDM-400P with 2 x FXS and 2 x FXO.    I'm finding that there seems to be an odd relationship to sound quality on the card to my local when connecting via a SIP client.

When I'm on my local network, if I connect to Asterisk via a SIP client (such as x-pro), and dial an outside line through the card, sound quality seems quite good.

However, when I'm at a remote location and connect via the same SIP client and dial an outside line, the audio quality is fuzzy, sometimes quiet, and generally more difficult to understand.

I spent a bunch of time troubleshooting the SIP end of things, thinking that's where the problem was, until I realized that every other SIP connection I make (from remote) yields a high quality call.  ie.  I can dial another SIP client and maintain high quality audio.  Additionally, I can dial an extension that not only SIP connects to my server, but from there goes out an IAX2 connection to another remote Asterisk server, from there to another SIP client, and the audio quality is excellent.

Therefore, I don't think the audio issue I'm experiencing is on the SIP end.

Are there some wierd SIP -> ZAP timing / conversion / other issues that could be causing this?

thoughts?

regards,

Paul
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