Update: SBX still not sending Authorization Digest Username to SIP provider - NexVortex so no outgoing calls on SIP. Incoming works fine. Has worked for a year! Replaced/reprogramed everything - still no go. NexVortex comes to the rescue! Instead of authorizing outgoing calls via auth name and password we are now using public IP. NexVortex enabled "IP Screening". Still waiting on Vertical Tech Support on why SBX will not send Auth Name.