[VoiceOps] What does an ALG actually do?

Richard Barnes richard.barnes at gmail.com
Wed Feb 27 17:43:02 EST 2013

If you look for "SBC" or "B2BUA" as synonyms for "SIP ALG", I expect you'll
find lots of thing people think they're good for.

On Wednesday, February 27, 2013, John Levine wrote:

> I realize that an ALG is a hack in a router that is supposed to allow
> SIP packets to go through a NAT router.  I also realize that for
> modern SIP equipment, ALG usually causes more problems than it solves,
> and that it's described in RFCs 2663, 3424, and others.
> What I can't find anywhere is what a SIP ALG actually does to the
> packets.  Is that written down anywhere, or is it just network
> folklore?
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