Outbound Caller ID: "Company Name" <17878900017> 

Trunk Name: Client or Phone Number

PEER Details:
username=xxxxx
type=peer
secret=xxxxxx
nat=yes
insecure=very
host=209.91.245.5
fromdomain=sip-proxy.vozpr.com
disallow=all
context=from-pstn
allow=g723.1&g729&ulaw&alaw

USER Context: username xxxxxxxx

USER Details:
useragent=ast_pbx
qualify=yes
port=5060
nat=yes
insecure=very
host=209.91.245.5
disallow=all
context=from-pstn
canreinvite=no
allow=g723.1&g729&ulaw&alaw

 Register String:
username:password@sip-proxy.vozpr.com