I think most people use sipsak in a script on the same server as ser to register at the intervals required.  If it's not registration, but authentication of INVITEs that is required, you need to take a look at the UAC module (only in SER head). There is also a 0.9.x backport.
http://www.voice-system.ro/downloads/uac/
Search for "uac increment cseq" to see auth issues with uac (also a note in the README, I think).
g-)
----- Original Message -----
From: Voipers Portugal
To: serusers@lists.iptel.org
Sent: Saturday, November 26, 2005 12:54 PM
Subject: [Serusers] Gateway registration and call forwarding

Hello again
 
Imagine the following scenario:
 
I have a SER server working with my SIP users. Imagine that i want to offer them the possibility of making PSTN calls. I have just made an agreement with a termination provider and they gave me a user id, a password and the gateway address. They told me i needed to register before making calls.. How can i make SER register in that gateway? And then to allow the PSTN calls, what should I do?
 
Jose simoes


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