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[nn] NAT -> SIP Issues

To: nn@qorbit.net
Subject: [nn] NAT -> SIP Issues
From: "J. Oquendo" <sil@infiltrated.net>
Date: Wed, 31 Jan 2007 15:10:34 -0600
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Hey all... I'm trying to assist someone who is having issues with their NS20 
but I don't understand enough about their topology to get them working 
properly. So I have a quick question regarding SIP ;)

This is the relevant portion of their get config (at least pertaining to SIP)

set service "PBXtra" protocol udp src-port 0-65535 dst-port 5060-5060
set service "PBXtra" + udp src-port 0-65535 dst-port 10000-51000
set service "PBXtra" + udp src-port 0-65535 dst-port 4569-4569
set alg sip app-screen unknown-message route permit
set alg sip app-screen unknown-message nat permit
set interface untrust ip 10.10.5.190/29
set interface untrust nat
set interface "untrust" mip 10.10.5.189 host 10.134.160.16 netmask 255.255.255.
set interface "untrust" mip 10.10.5.188 host 10.134.160.10 netmask 255.255.255.
set address Untrust "0.0.0.0/0" 0.0.0.0 0.0.0.0
set policy id 6 name "PBXtra" from "Untrust" to "Trust"  "Any" 
"MIP(10.10.5.189)" "PBXtra" permit log
set policy id 6 application "SIP"
set policy id 6
set service "SIP"

... According to them, they cannot register phones from their location to the 
PBX to ours...

They don't want to place their PBX in a DMZ, they want it doing NAT, and from 
what I understand NAT+SIP is sketchy...

What's happening because of NAT is, when an outbound call goes out, the 
Netscreen's IP address replaces everything in the SIP message:

>>From 10.10.5.188 --> Netscreen --> 10.10.5.189 --> PBX 
PBX 10.10.5.189  --> Netscreen ... Netscreen (And what I'm I to do with this!)

Is there a surefire implementation someone has used to get this working? TIA

-- 
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
J. Oquendo
echo @infiltrated|sed 's/^/sil/g;s/$/.net/g'
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743

"How a man plays the game shows something of his
character - how he loses shows all" - Mr. Luckey 
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