Yes, I have different registrations for each port. I'm actually running Astlinux on a thin client. How would I go about making it skip over busy ports? Also, I don't have any outgoing trunks registered. I use it to connect to the collectors network (C*net).
If you need any more details please ask. I admittedly know very little about Astlinux. I have been able to add extensions, either in the form of ATA's or a 6 line Cisco I recently added, without much trouble. Primarily by adding the info to sip.conf and extensions.conf. I haven't really needed to do much else to get things working.