• using SIP trunking, we can build our own phone network
  • a SIP peer is defined only slightly differently from a friend who logs in normally
  • [trunk-ubuntu-centos]
    type=friend
    host=linux3
    context=linux3
    username=trunk-centos-ubuntu
    secret=some_password
  • this gets referenced in extensions.conf
  • exten => _91.,1,Set(CALLERID(num)=98${CALLERID(num)})
    exten => _91.,2,Dial(SIP/trunk-ubuntu-centos/${EXTEN:2},20,rt)
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