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FireBrick SIP Configuration: Difference between revisions
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''(This is a first draft and may need updating. - 10 October 2010)''
The FireBrick can be used for VoIP by being a VoIP gateway (FBSIP). Your local (or remote) SIP devices register against the FireBrick, and the FireBrick registers to your SIP provider, in a sense the Firebrick acts as a back-to-back SIP gateway.
You can have multiple SIP provider (carrier) accounts, and incoming calls can be routed to internal extensions and these extensions can be individual phones or a group which can then ring multiple phones in various ways. An advantage of using the FireBrick in this way is where you are forced to use RFC1918 IP addresses (private) on your LAN and the FireBrick is NATing traffic. Typically the FireBrick will be connected to the ISP by PPP itself and will have a public IP address, therefore the SIP is not being put through NAT. (SIP and NAT don't work well together)
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