[Serusers] Multiple cisco ATAs behind NAT - One way audio

[Jesus Rodriguez]

On Sun, 4 Jan 2004, Jiri Kuthan wrote:

> At 09:06 PM 12/21/2003, Chris Mulhern wrote:
> >I was wondering if anyone can help me.  We  (my company) are having a problem with sending calls to multiple Cisco ATA 186s behind a NAT.  We get one way audio.....we have a company in Iraq that is part business, but also a relief organization.  We need someone to help us get these calls working, so that a doctor from Boston can call into a hospital in Baghdad and work with the doctors there (for example).  We have VoIP and networking people working on it, but there is a problem with the port assignments (not sure of more detail yet).
>
> Well, ATAs don't have very good NAT traversal properties -- modern
> phones support STUN. Since there are NATs which are hard-to-traverse
> even for STUN-capable phones, you also need to solve such cases
> on the SER part. Getting over NATs is generaly a tricky manner for
> which you need a solid strategy. Let me know if you still need help
> on this.

Version 3.0 of ATA software has STUN support and some other new features.

Saludos
JesusR.

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Jesus Rodriguez
VozTelecom Sistemas, S.L.
jesusr at voztele.com
http://www.voztele.com
Tel. 902360305
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