I just started installing ser the other day and the installation was smooth and painless.  I am know not quite sure about about the configuration files and how to set them.  Here is my current setup --  I have a fedora 3 linux box obtaining a dhcp assigned address with currently no hostname set and no FQDN-- localhost.localdomain.   I signed up the other day to iptel.org to register for a username and password -- ie, example@iptel.org.
 
So i have 2 issues.  1.  What should i specify in my /etc/profile for SIP_DOMAIN -- should i use my example@iptel.org or my internal lan address or my wan address available to the outside?
 
2.  Same question when it comes to configuring the /usr/local/etc/ser/ser.cfg
what should be listed on the listen parameters
listen=127.0.0.1
listen=192.168.x.x or should it be the wan address
 
also can i use the alias
alias=example@iptel.org  or should this be my machines hostname. 
 
Regards,
 
Alfred