VoIP Mailing List Archives

[john at quonix.net]

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

[greg.oliver at cistera...]

On Feb 2, 2008, at 2:11 PM, John Von Essen <john at quonix.net> wrote:

[greg.oliver at cistera...]

On Feb 2, 2008, at 3:43 PM, john at quonix.net wrote:

[robert.norton at sopht...]

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:

[lugosoft at gmail.com]

[john at quonix.net]

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.



----------------------------------------------------

[lists at minotaur.cc]

[shadowym at hotmail.com]

Do you have a range of registration ports configured and forwarded through
the firewall on the server end? Ie. 5060-5065 for example.

On the Phone side you should forward 5060 to phone1 and 5061 to phone 2 etc.
and configure the phones to use that port for registration. You may need to
forward ports for the actual voice as well. 2 ports per phone so 10000-10001
for phone1 and 10002-10003 for phone2. It's either that or mess around with
STUN or Proxy servers or whatever.

SIP+NAT=headache



-----Original Message-----
From: john at quonix.net [mailto:john at quonix.net]
Sent: Saturday, February 02, 2008 8:23 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Multiple SIP phones behind a Linksys firewall

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.