SIP

sip-ua
set pstn-cause 6 sip-status 503
set pstn-cause 18 sip-status 408
set pstn-cause 27 sip-status 502
set pstn-cause 31 sip-status 480
set pstn-cause 44 sip-status 503
set pstn-cause 58 sip-status 503
set pstn-cause 88 sip-status 503
set pstn-cause 95 sip-status 503
set pstn-cause 102 sip-status 504
set pstn-cause 111 sip-status 500
retry invite 4
retry response 4
retry bye 4
retry cancel 4
registrar ipv4:192.168.1.2 expires 3600 secondary
sip-server ipv4:192.168.1.3

SIP User Agent
Maps PSTN cause code to SIP errors codes.

Needed to register to Asterisk so MWI will work.
All outbound calls will be sent to the Session Boarder controller which is a SanSay box.