Thanks AJ- have set it to 5 mins via telnet: srv dhcp leasetime 600. Will
get permission to try new firmware later!

JT



On 21 November 2011 10:45, Arthur Stanfield <a...@dmcip.com> wrote:

> Hi John,
>
> We've had similiar issues with customers behind the 2920 connecting to a
> hosted asterisk system. If you rebooted a phone it often didn't
> re-register, Checking the NAT sessions table on the router revealed stale
> nat sessions open for the phone.
>
> On the advice of Dreytek we found a fix by lowering the NAT session
> timeout from the default of 24hrs down to 5 minutes and installing the
> latest release of the firmware (3.3.7) it may not be available on the UK
> Site at the moment (It wasn't when we did the upgrade!) but it can be got
> from ftp://ftp.draytek.com/Vigor2920/Firmware/v3.3.7/
>
> It may help, It may not - But its quick easy fix if it does.
>
> Regards,
> AJ.
>
>
> ----- Original Message -----
> From: "John Taylor" <j...@vetsurgeon.org.uk>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <
> asterisk-users@lists.digium.com>
> Sent: Monday, 21 November, 2011 10:20:14 AM
> Subject: [asterisk-users] vigor 2920 problems
>
> One of our clients has a Draytek Vigor 2920- their natted Snom phones
> behind it are registered to an Asterisk 1.4 server on an external public
> IP.
>
> I've set QOS, bandwidth management and turned off the SIP ALG via telnet
> but I'm still having some problems with some of the phones losing
> registration if Asterisk is restarted.
>
> I can see the phones sending SIP REGISTER messages, but they never
> arrive at the server; this happens in about half of the phones- with no
> consistency as to which lose registration.
>
> It looks like the router is swallowing the messages, or there's some
> kind of NAT problem. Other clients at other sites are fine.
>
> The problem clears if the phone is rebooted (renegotiates a new nat
> path?)
>
> Any help warmly appreciated.
>
> John
>
> --
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