asterisk users - Feb 2008 - Multiple SIP phones behind a Linksys firewall

And the firewall is in between the phones and both servers or are you
registering the phones on a local server and trunking to the other server
through the firewall?

 In terms of nat and Cisco 7960s I've never had a issue registering two of
them behind nat to a server on the other side, however, if you called one phone
from the other, you'd end up with one way audio.



-----Original Message-----
From: Greg Oliver <greg.oliver at cistera.com>
Sent: Saturday, February 02, 2008 2:15 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users
at lists.digium.com>
Subject: Re: [asterisk-users] Multiple SIP phones behind a Linksys firewall



On Feb 2, 2008, at 2:11 PM, John Von Essen <john at quonix.net> wrote:
> I posted an email a few days regarding a problem with hearing the
> voicemail greeting on my sip phones.
>
> It turns out to be a phone/stun/linksys issue - not an asterisk issue.
> Which brings up a couple of questions....
>
> I always assumed that you can have multiple SIP phones behind a  
> Linksys
> firewall/router (WRT54G) all using the same STUN server/port.
>
> But apparently thats not the case. Is it a Linksys bug, a  
> Grandstream bug
> in the BudgeTone-100 phone, or am I off base and just doing something
> wrong?
>
> I cleary have problems as soon as I try to use a second phone behind  
> the
> Linksys - registration issues, cant hear voicemail greeting, etc.,.
>
> My next test was to run multiple STUN servers on the same machine with
> different ports. Then, for my multiple SIP phones behind the  
> Linksys, have
> each phone use a different stun port.
>
> Any thoughts?
>
> John
I have 3 phones connected to 2 servers behind a 54g running openwrt  
with no stun or any special configuration. I am running cisco phones  
which do nat well natively.

-greg
>
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The server is at a remote datacenter - no nat, no firewall, pure public 
IP. 

The phones are at home offices (i.e. DSL or Cable with Linksys-type 
firewall/routers). 

My initial testing was with a single SIP phone at the home office - and 
everything worked fine. But when I have two SIP phones at the home office, 
things start behaving badly. 

I understand the issue of phone-to-phone, where both phones are behind a 
nat at the home office - but that is not the issue I am having. 

My main problem is when I have two phones at the home office, the second 
phone cant register, and/or, you cant here the voicemail greeting when you 
try to check messages. 





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