[Asterisk-Users] MGCP behind NAT

[ishpreet at optonline.net]

Hello Wade:

There is MGCP firmware available too which appears to help in NAT mode. I have been playing around with these CPG for quite a few months now. 

I have been able to get them to work only with G711 codecs. I was unable to create a coding profile to work successfully with either G723 and G729 codecs. Have you tried to use these codecs on the DG104S ??? Maybe we exchange some notes on this.

Ish


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Message: 8
From: "Wade Weppler" <weppler at wwworks-inc.com>
To: <asterisk-users at lists.digium.com>
Date: Wed, 30 Jul 2003 15:09:35 -0400
Subject: [Asterisk-Users] MGCP behind NAT
Reply-To: asterisk-users at lists.digium.com

Hi,

After spending some time trying to get a DG-104S working behind NAT,
I finally found the problem.

I made the incorrect assumption that nat=yes in mgcp.conf works just
like sip.conf.  The channels within a gateway are treated more closely to
zap channels than sip channels (from a .conf standpoint).

What this means is that you have to put nat=yes BEFORE any
subchannel definitions:

This works:

nat=yes
line => aaln/1
line => aaln/2
line => aaln/3
line => aaln/4

This doesn't:

line => aaln/1
line => aaln/2
line => aaln/3
line => aaln/4
nat=yes


This makes sense if lines were treated as individual channels through NAT,
but they aren't.  NAT capability is dictated by the Gateway itself, and not
each endpoint/subchannel.

I hope this saves somebody some time.

-wade