I tried that already, In fact I had the settings at "sip only" since I got rid of the pstn lines, a year ago. I am trying to add a fax line as incoming only, to use it as a failover for sip, since the fax does not accept inbound calls anyway. The problem is that occaisionaly when someone makes an outbound call it picks up the pstn line, and sometimes you hear an outbound fax. I was looking for a way to either completely disable outbound pstn or use a different access code, such as "8" to activate outbound pstn and keep "9" as the access code for sip.
