[Asterisk-Users] Remote employees using Polycom 501 lose abilityto receive incoming calls after few minutes.

[Cullin J. Wible]

Polycom phones support STUN - that should solve the issue too.

Cullin 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dr. Michael J.
Chudobiak
Sent: Wednesday, June 28, 2006 1:30 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Remote employees using Polycom 501 lose
abilityto receive incoming calls after few minutes.

Von L. wrote:
> plugged in. They work immediately after being plugged in, but they 
> lose the ability shortly thereafter. They can always make outbound 
> calls, but only to real phone numbers, not extensions.
> 
> They each have NAT routers, and I have triple checked that they have 
> opened/forwarded the correct ports, basically 5060-30000 UDP. Once 
> they


See the "NAT Issues" section at http://www.voip-info.org/wiki/view/IAX.
(The page is for IAX2, but the NAT issues are relevant for UDP SIP ports
too).

Basically, some NAT routers "forget" UDP mappings after a VERY short time
(like 30 seconds). Took me a while to figure that out.


- Mike

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