[ext-paging]
exten => PAGE1000,1,Set(__SIPADDHEADER=Call-Info: answer-after=0)
exten => PAGE1000,n,Set(__SIP_URI_OPTIONS=intercom=true)
exten => PAGE1000,n,Set(__ALERT_INFO=Ring Answer)
exten => PAGE1000,n,Dial(SIP/100&SIP/120&SIP/122&SIP/103,5)
;exten => Debug,1,Noop(dialstr is LOCAL/PAGE1000@ext-paging)
exten => 331,1,Page(LOCAL/PAGE1000@ext-paging)