asterisk users - Jul 2003 - Welltech FXS SIP registering with Asterisk

I have a number of Welltech FXS  devices (running the SIP code) that I'm 
trying to register with Asterisk. Has anyone had any success doing this?

If I have the Welltech set in peer-to-peer mode, I can call to and from the 
Welltech, to Asterisk, just fine. However, because it's in peer-to-peer 
mode, I can only call phone numbers that are in the static phone directory. 
The phone directory in the Welltech does not support using the * character 
to send all digits to a specific device (such as 1-206*). I have to put in 
the full e164 number (such as 1-206-555-1212) in order to make it work.

Has any one had any experience with the Welltech devices and getting them 
to register with Asterisk properly?

Thanks in advance.

Michael