Configuration Cisco Call Manager

dial-peer voice 77 voip
destination-pattern 77
session protocol sipv2
session target ipv4:213.175.221.14
dtmf-relay rtp-nte
codec g711ulaw
clid network-number username
!
sip-ua
authentication username username password password
nat symmetric check-media-src
registrar ipv4:213.175.221.14 expires 3600
sip-server ipv4:213.175.221.14.