clean up, typos fixed: ie → i.e. (2), eg → e.g. (5)
| Internal extension number where incoming calls are routed to (
eg a user or a group)
| IPs that are allowed to talk SIP to us (
ie the carriers IPs). (Optional)
If you have further SIP accounts with carriers then add those too.
==Next create some users
[[File:FireBrick-VoIP-AA3.png|thumb|VoIP User Screenshot]]
| IPs that are allowed to register, put in your LAN ip addresses,
| The full number for this user,
ie same as the carrier's number assigned to you.
You can repeat this process for your other users, changing the extn each time,
eg 102, 103 etc.
At this point you can configure your SIP phones to register to the FireBrick with the credentials you've specified above.
You can then test by calling each other using the extn numbers assigned.
| The name that will display on the phone,
| Ring All
| This is the ring type,
eg to ring all at once etc.
SIP and RTP traffic will need to be allowed in to the FireBrick. This will need to be from the carrier, but also from external SIP phones if you have any.
Take a look at this wiki page for more info: [[FireBrick_2700#VoIP_Rules FireBrick_2700#
VoIP_Rules|FireBrick and VoIP Firewall]]