Configuring a sip account shouldn't be much different.  You just need to fill in the details for the gateway.  Just have to figure out what details you need to make it all work with your switch.

On May 27, 2008, at 8:12 AM, Cavalera Claudio Luigi wrote:
Hello,
I have got a class 4 softswitch connected to public network via E1, ISUP
etc...
My softswitch already accepts SIP Invites arriving from IP address of my
freeswitch installation (1.0 "phoenix").
I would like to configure a SIP trunk class 4 between freeswitch and my
softswitch; I've tried following instructions 
http://wiki.freeswitch.org/wiki/Tested_Phone_Providers_Listing
but I think these are not the same as they are not class 4.
Could you please point me to the right instructions on the wiki?
Thanks a lot,
Claudio

Brian West
sip:brian@freeswitch.org