Please bear with me, I bought this unit to replace the PAP2 because I need a Fax line. I have 2 phone numbers both connected to the FXS ports. Internet>Router>spa2102>Phone and Fax. The router in spa2102 is in bridge mode. I setup Line 1 to be used mostly for voice calls and Line 2 for FAX calls. Line 1 and 2 configs are attached.
Basically, both phone numbers work in Line 2 (including FAX). However in Line 1 only the inbound calls work. Outbound calls do not work. When I dial a number, it goes busy immediately. I tried various configs and countless suggestions from the VOIP provider to no avail.
Interestingly, both phone numbers work in Line 1 and 2 of the PAP2 except the fax transmission only works maybe 50% of the time.