[from-pstn]
exten => s,1,Dial(SIP/110,45)
exten => s,n,Answer
exten => s,n,Playback(pleasehold)
exten => s,n,System(cp /etc/asterisk/intercom.call /etc/asterisk/intercom.outgoing)
exten => s,n,System(mv /etc/asterisk/intercom.outgoing /var/spool/asterisk/outgoing)
exten => s,n,Wait(1)
exten => s,n,Dial(SIP/107&SIP/103&SIP/109&SIP/101&SIP/104&SIP/111&SIP/124&SIP/125,10,m)
exten => s,n,Goto(afterhours,s,1)

                [intercomincomingcall]
                exten => 1,1,Playback(attentionthephoneisringing)
                exten => s,1,Answer
                exten => s,n,SIPAddHeader(Alert-Info: Auto Answer)
                exten => s,n,Page(SIP/109&SIP/101&SIP/104&SIP/111&SIP/124&SIP/125)
                exten => s,n,Hangup



intercom.call

Channel: Local/1@intercomincomingcall
MaxRetries: 2
RetryTime: 60
WaitTime: 30
Context: intercomincomingcall
Extension: s
Priority: 1
Callerid: ATTENTION
AlwaysDelete: Yes