dial-peer voice 77 voip
 destination-pattern 77
 session protocol sipv2
 session target ipv4:64.85.162.136
 dtmf-relay rtp-nte
 codec g711ulaw
 clid network-number username
!         
sip-ua    
 authentication username username password password
 nat symmetric check-media-src
 registrar ipv4:64.85.162.136 expires 120
 sip-server ipv4:64.85.162.136