This configuration has been tested on both Asterisk 1.6 and 1.8, and FreePBX version 2.8.
General Settings:
Set your Outbound CID and your max channels.
Dialed Number Manipulation Rules:
Calls must be dialed as 1+AREA CODE
Outgoing Settings:
Trunk Name: Telepacific
Peer Details:
type=peer
context=from-tpac
dialformat=${EXTEN:1}
canreinvite=yes
hasexten=no
hasiax=no
hassip=yes
host=<IP Address of Tpac Gateway>
port=5060
registeriax=no
registersip=no
trunkstyle=customvoip
fromdomain=smartvoice.telepacific.com
insecure=port,invite
allow=g729
disallow=gsm,alaw,g726,ulaw
dtmfmode=rfc2833
hasvoicemail=no
mailbox=
Incoming Settings/Registration
Both sections blank.
Other Notes
The following may or may not be necessary, depending on your config. Our inbound dial path was set to ring a group of extensions and was timing out, hence the Answer statement below. If you decide not to use the code below, be sure to change the context stanza in the code above.
/etc/asterisk/extensions_custom.conf
[from-tpac]
exten => _.,1,Answer
exten => _.,n,Goto(from-trunk,${EXTEN},1)