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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

FireBrick SIP Configuration: Difference between revisions

First, a few comments about SIP, NAT and the FireBrick...
The FireBrick maps ports and IPs for NAT but provides no ALG for SIP or any other protocol. SIP is notoriously difficult with any sort of NAT, with or without ALGs.
 
We have seen SIP work with FireBricks in this case, where the end device and the SIP call server both do things in just the right strange and non standard way to cope with the mapping, but it is rare. It also usually requires that UDP sessions be configured to be open for a long time on the FireBrick (ongoing-timeout setting on the firewall rules).
 
In general we would never suggest using SIP with NAT for this reason, and it is partly why the FireBrick itself includes a full back to back SIP gateway allowing SIP registrations in and out and a-law RTP via the FireBrick. Used in this way it can avoid any NAT issues, but does specifically need configuring to meet your needs.
 
FireBrick. Used in this way it can avoid any NAT issues, but does specifically need configuring to meet your needs.
 
= Set-up =
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