username=XXXXXXX
type=peer
secret=XXXXXXX
qualify=250
outboundproxy=sip-proxy.lax0.cbeyond.net
nat=never
dtmfmode=auto
insecure=port,invite
host=sipconnect.lax0.cbeyond.net
fromdomain=sipconnect.lax0.cbeyond.net
disallow=all
context=from-trunk
canreinvite=yes
allow=ulaw
username:password@cbeyond/username
to fix the DTMF issues in later version of elastix and asterisk 1.6 check the following article
On a recent install of Elastix 2.02 (asterisk 1.6) install I noticed that my usuall trunk DTMF setting for Cbeyond no longer worked. I could not use any IVR’s. To fix remove the DTMF setting on the cbeyond trunk. Go to unembedded freepbx. Under tools choose Asterisk SIP settings. Under Other SIP settings put in the following below. Reset Asterisk and you should be good to go.
