[Asterisk-Users] NAT and SIP

[Eric Wieling]

Rich Adamson wrote:

> For example, the first sip session will use udp 5060, but on weird
> nat boxes the second sip session will get mapped to udp 5061 (or 
> something like that), and obviously * isn't listening on that port.


The port that shows up in "sip show peers" is the remote SOURCE port 
and addresss.  Asterisk does not normally care about such things.  Any 
NAT router that modified the DESTINATION port and address would not 
not work.

Does anyone know of a basic NAT for Dummies document that I can point 
people to?  This is something that comes up again and again from 
people that don't understand how NAT works.