In this example we want to ring all the external numbers of a few people only by dialing extension 3331.
1: Connect to CCME and create a new dial-peer:
dial-peer voice 3331 voip description External Emergency Responders destination-pattern 3331$ session protocol sipv2 session target ipv4:192.168.0.XXX #(the Asterisk box) dtmf-relay rtp-nte cisco-rtp codec g711ulaw no vad
2: Connect to the asterisk server and add the extension in the default [incoming_context] in /etc/asterisk/extensions.conf: (192.168.0.YYY is the outgoing trunk)
exten => 3331,1,Dial(SIP/5145555555@192.168.0.YYY&SIP/51455555519@192.168.0.YYY&SIP/5145555552@192.168.0.YYY&SIP/5145555553@192.168.0.YYY&SIP/5145555554@192.168.0.YYY&SIP/5145555555@192.168.0.YYY) exten => 3331,n,Hangup
3: Reload asterisk config and test the extension 