#CISCO DIAL PEER

dial-peer voice 9990102 voip
 destination-pattern 501.
 session protocol sipv2
 session target sip-server
 session transport udp
 dtmf-relay rtp-nte h245-alphanumeric
 codec g729r8 bytes 60

CISCO SIP.conf entry

[172.16.4.64]
type=friend
qualify=no
nat=no
host=172.16.4.64
dtmfmode=rfc2833
context=default
canreinvite=yes
unsecure=very