You need to look at when NAT is detected (nat_uac_test) for INVITE and for 200 OK in onreply route for the same call. Make sure NAT is detected for both, if not, find out why it is not detected. g-) Gareth Owen wrote:

Thanks Greger, I've already worked through the getting started doc and think I've got a good understanding but am still getting the one-way audio. Can you suggest anything to help me understand how I can track the problem? Thanks gareth.

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*From:* Greger V. Teigre [mailto:greger@teigre.com] *Sent:* 04 January 2007 06:5 *To:* gareth.owen@bevoice.net *Cc:* serusers@lists.iptel.org *Subject:* Re: [Serusers] One way audio

Try gettingstarted doc. http://iptel.org/ser/doc/gettingstarted g-)

Gareth Owen wrote:

Can someone help?

I am fairly new to SER and Mediaproxy and can't find a detailed explanation of how nathelper etc work, so I'm struggling!

My config is:-

SER 0.9.6

Mediaproxy 1.7.2

Fedora Core 4 86x64

SER and Mediaproxy run on the same server which acts as a gateway to a remote Sonus PSTN gateway over a VPN.

I also use Asterisk on my local network. The SER server acts as a router between Asterisk servers and the PSTN via the Sonus. This works fine but my problem is when I attempt to use X-Lite 3.0 UA behind NAT on a remote network. Asterisk is not used in this config but proves that two way audio is fine using SER and the Sonus gateway.

Problem: X-Lite behind NAT on remote network to Sonus PSTN gateway via SER and Mediaproxy, I get only one ay audio. The audio is fine from X-Lite to PSTN but not in the reverse direction.

Thanks for your help

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