asterisk users - May 2007 - Phone losing IP address for a few seconds but doesn't drop call

Hi,

Recently I've noticed on a customer's GXP-2000 phone that it loses its
IP
addresse for a few seconds, audio goes blank obviously, and after about
30-60 seconds get the same IP addresse back and resumes the call. This shows
that call was not dropped but phone lost connection with the server, whereas
the caller on the other end was still talking. This is just unacceptable as
this is effecting his business.

Apparently this is a router related issue. Its a D-Link DI-624 router. This
happens even when there is no Internet activity at all.

How can this issue be resolved. What are the reasons for losing contact with
the router. Is there some interference at port 5060, bad wiring, or
something else?

-- 
Zeeshan A Zakaria
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Zeeshan Zakaria wrote:
> Hi,
>
> Recently I've noticed on a customer's GXP-2000 phone that it loses
its
> IP addresse for a few seconds, audio goes blank obviously, and after 
> about 30-60 seconds get the same IP addresse back and 

The phone is probably renewing it lease with the DHCP.  Set your expire 
time to a larger number.  I've got mine set for 30 days.

Doug


-- 
 
Ben Franklin quote:

"Those who would give up Essential Liberty to purchase a little Temporary
Safety, deserve neither Liberty nor Safety."

Does it loose it's IP address consistently and at a designated  
interval.  I've seen something similar in a number of various cases  
where it was always an issue
of the 'client' device blocking the DHCP renew traffic.  But when it  
went into rebinding it would drop $filter and allow the dhcp traffic  
back through.

I would say check to see if it occurs at a regular interval and  
compare that with the lease times.  Also consider it's sometimes a  
good idea if the phone supports it (I don't know if your does)
but setting up a cheap syslog host that can catch the syslog messages  
from the unit.  Some units will log why they dropped their network  
(ie dhcp) or something.

This was just a wild stab.


On May 18, 2007, at 8:51 AM, Zeeshan Zakaria wrote:
> Hi,
>
> Recently I've noticed on a customer's GXP-2000 phone that it loses
> its IP addresse for a few seconds, audio goes blank obviously, and  
> after about 30-60 seconds get the same IP addresse back and resumes  
> the call. This shows that call was not dropped but phone lost  
> connection with the server, whereas the caller on the other end was  
> still talking. This is just unacceptable as this is effecting his  
> business.
>
> Apparently this is a router related issue. Its a D-Link DI-624  
> router. This happens even when there is no Internet activity at all.
>
> How can this issue be resolved. What are the reasons for losing  
> contact with the router. Is there some interference at port 5060,  
> bad wiring, or something else?
>
> -- 
> Zeeshan A Zakaria
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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Phone: 703-944-9909
                        -+-
Cablemodems are the gateway to the Internet.
The Internet is a gateway to some things that are  better left un-seen.


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On 5/18/07, Zeeshan Zakaria <zishanov@gmail.com>
wrote:
>
> Hi,
>
> Recently I've noticed on a customer's GXP-2000 phone that it loses
its IP
> addresse for a few seconds, audio goes blank obviously, and after about
> 30-60 seconds get the same IP addresse back and resumes the call. This
shows
> that call was not dropped but phone lost connection with the server,
whereas
> the caller on the other end was still talking. This is just unacceptable as
> this is effecting his business.

Sounds like DHCP to me. I've not had this problem with a GXP-2000. If it
were me, I would try setting the IP address to a static IP to rule out any
kind of DHCP weirdness.

Now, if it still happens, then it's not really losing its IP; instead, it
will be losing the connection. Or it could be unregistering with the
Asterisk server for some reason, and then re-register 30-60 seconds later.
That's still bad, but it's different than losing one's IP.

One way you may be able to more accurately diagnose the problem would be to
run Ethereal or some other packet sniffer and see if the voice packets get
through your router. If not, fix or replace your router. If so, you'll need
to do more detective work to see if you have a phone problem, configuration
problem, cabling problem, bad port on the switch, etc.

Hope that helps,
David
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> Recently I've noticed on a customer's GXP-2000 phone that it loses
its IP
> addresse for a few seconds, audio goes blank obviously, and after about
30-60
> seconds get the same IP addresse back and resumes the call. This shows that
call
> was not dropped but phone lost connection with the server, whereas the
caller
> on the other end was still talking. This is just unacceptable as this is
effecting his
> business.
We have also had this happen at client sites. I don't think it's a
router issue, since we've had the same thing occur using a variety of
different routers. There are 2 possible reasons for it:
1) The firmware version on the GXP2000 isn't doing DHCP queries properly -
when it connects to the server to renew its IP, instead it thinks the
server's given it a different one (which of course it hasn't). I'm
guessing the phone drops the network interface then brings it back up.
2) The "auto check firmware every...." option was known to cause the
phone to reboot in some firmware versions when the phone checked for new
firmware/config from the TFTP server.

We worked around the issue at one place by giving all the phones static IPs (and
configuring them in the phones manually) and disabling "auto check
firmware". At another location where static IPs would have been impractical
(some staff take them home at weekends), we simply upped the lease time on the
DHCP server to 7 days.

Of course, you may find that simply trying different versions of the firmware
resolve those issues.

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
For full contact details visit http://www.minotaur.it/chris.html
This email is made from 100% recycled electrons

As others have said, it does sound like a DHCP issue.. you can try
increasing the lease time, or giving it a static IP address.

On 5/18/07, Zeeshan Zakaria <zishanov@gmail.com>
wrote:
>
> Hi,
>
> Recently I've noticed on a customer's GXP-2000 phone that it loses
its IP
> addresse for a few seconds, audio goes blank obviously, and after about
> 30-60 seconds get the same IP addresse back and resumes the call. This
shows
> that call was not dropped but phone lost connection with the server,
whereas
> the caller on the other end was still talking. This is just unacceptable as
> this is effecting his business.
>
> Apparently this is a router related issue. Its a D-Link DI-624 router.
> This happens even when there is no Internet activity at all.
>
> How can this issue be resolved. What are the reasons for losing contact
> with the router. Is there some interference at port 5060, bad wiring, or
> something else?
>
> --
> Zeeshan A Zakaria
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
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