4 Jan
2004
4 Jan
'04
11:31 p.m.
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.
-jiri