I would first take a look at a packet capture. You need to see exactly what name the phone is trying to invite.

From: serusers-bounces@lists.iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Nahum Nir
Sent: Monday, April 12, 2010 2:31 PM
To: serusers@lists.iptel.org
Subject: [Serusers] Problems Using iptel accounts

Hi all,

I have made two accounts at iptel: nahum1 and nahum2. I have two computers running X-Lite, both of them registered succesfully. But when I try to invite I get 404 Not Found. I'm dialing nahum2@iptel.org.

What an I doing worng?

Thanks,

Nahum

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