I pointed the ATA186 directly to the AS5300 without proxy server, the same problem happened. So I drew a conclusion that the problem was on the Gateway side. After changing the T1 port on the AS5300, it worked well.
----- Original Message -----
From: Bo
To: serusers@lists.iptel.org
Sent: Sunday, March 16, 2003 11:30 PM
Subject: [Serusers] 503 service unavailable

I am doing some tests between Cisco ATA186 and AS5300 by using SER as the proxy server. AS5300 sent back 503 (service unavailable). Anyone has any clue on this?
 
Thanks