[asterisk-users] Grandstream GXP2000 Loses Connectivity

[Lutgring, Sam]

I am using about 70 Grandstream GXP2000 phones on 1.1.5.15 code with *
1.4.16.2 and have not experienced any of these issues.  The one thing
that I would suggest is make sure that you are using RFC2833 for you
DTMF Mode.  I was originally using INFO and ran into some strange issues
with dropped calls.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Thomas
Kenyon
Sent: Tuesday, February 12, 2008 4:38 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Grandstream GXP2000 Loses Connectivity

Peder @ NetworkOblivion wrote:
> I hate to reply to my own message, but I have some more info from 
> debugging.  A Grandstream tries to register and uses a nonce and it is

> accepted by *.  The next time it tries to register, it uses the same 
> none and * says "SIP/2.0 401 Unauthorized".  The Grandtream says "ok, 
> here try this new nonce" and then it works again.  Again, the next
time 
> it registers, it tries the old one and gets slapped again and gives a 
> new one.  After some indeterminate amount of time, the Grandstream 
> actually tries to use the same nonce 3 times in a row.  Once it works,

> the next time it gets a "SIP/2.0 401 Unauthorized" and then the third 
> time, it gets a "SIP/2.0 403 Forbidden".  This evidently causes the 
> Grandstream to completely give up registration as once * sends this,
the 
> Grandstream nevers tries to register again.  I've waited for 1-2 hours

> and it never tries again.  The "Forbidden" response appears to kill 
> registration until the Grandstream is rebooted.  Has anybody else seen

> this?  Or maybe know how to get around it?
> 
I must say that I never saw this behaviour, but when I was using 
1.1.5.15 the phones were cutting off regularly and dropping calls. In 
the end I rolled back to 1.1.4.25.

Have you spoken to techinical support?

One of their Tech Support people quite regularly reads the trixbox 
grandstream forum, so if you can't get through on the telephone then 
this might be a good place to look.

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