Hi Dave,

Thanks for the information. I don't have a Netgear. Wonder if you can do me a favor test it. The test plan is very simple,

Have a ser running with rtpproxy or mediaproxy enabled and set NAT ping interval with a small number, 15, 10, or 5 seconds. If you don't have time to setup one, please contact me offline, you can use my server.

Load xlite and ethereal on your pc which sits behind the NAT.

Use ethereal capture all packets coming from and to the ser server. The capture filter string is "host <ser-ip-address>".

Start xlite and register with the server. You should be able to see ser sending SIP packets (marked as malformed SIP in ethereal) periodically.

Shutdown xlite, you should still see ser NAT ping packets for a certain amount of time until it stops. The time is the NAT binding timeout value. If it never stops, congratulations... you've found a NAT device which allows inbound UDP packets refreshing the NAT binding timer.

Thanks for your help.

Richard

-----Original Message----- From: serusers-bounces@iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Dave Bath Sent: Sunday, August 22, 2004 12:29 PM To: serusers@lists.iptel.org Subject: RE: [Serusers] NAT ping and consumer router

Hey there,

At home I have Netgear ADSL router (1 x ADSL, 4 x eth) and have not had any problems with NAT devices dropping off. Mainly use Zyxel Wireless 2000 handsets.

Dave

-----Original Message----- From: serusers-bounces@iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Jesus Rodriguez Sent: 22 August 2004 19:59 To: Richard Cc: serusers@lists.iptel.org Subject: Re: [Serusers] NAT ping and consumer router

On Sun, 22 Aug 2004, Richard wrote:

Does anyone know and use a consumer router which works with NAT ping?

I did some research recently and can't find any. Basically if a phone

is

behind NAT, we need to keep the NAT binding in the router active even

if

there is no activity from the phone. NAT ping from ser (either

rtpproxy or

mediaproxy) tries to ping the phone with an empty SIP packet. However

this

inbound UDP packet can't always keep the NAT binding active because

some NAT

firewalls ONLY refresh the timer based on outbound packets. So the

result is

that the binding expires after a certain time even if NAT ping is

enabled.

For example, Dlink falls in this category. It appears the timeout is 3 minutes and NAT ping won't make it active.

If anyone has a good experience with any consumer router, can you

please let

share with us?

Use an UA that supports it (Sipura or Cisco for example).

Saludos JesusR.

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

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