[cisco-voip] VG248 constantly rebooting

[Wes Sisk]

Voicemail really has nothing to do with it.

It's more the race condition that occurs between the digital and  
analog signaling legs.

consider this case:

call is connected between ipphone user and vg248 analog phone user
ipphone user hangs up.  CM tells vg248 to go onhook.  CM immediately  
expects that port to be idle.  However, on the analog side the vg248  
has to drop loop current or do polarity reversal for up to 200msec to  
indicate disconnect supervision.  In this 200msec window CM sees the  
vg248 port as idle and can attempt to send another call.  When this  
happens several times the vg248 seems to roll over.

It's been mostly noted in voicemail deployments as those tend to use  
linear hunting (first available starting from first port).  If you  
have any such hunt groups that receive high call volume you could be  
encountering this issue.

/Wes


On Jul 11, 2006, at 7:43 PM, Lelio Fulgenzi wrote:

Thanks Wes. Our VG248 is not connected to a voicemail system, do you  
think that we might still be affected?

------------------------------------------------------------------------ 
--------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"I can eat fifty eggs." "Nobody can eat fifty eggs."
----- Original Message -----
From: Wes Sisk
To: Lelio Fulgenzi
Cc: cisco-voip at puck.nether.net
Sent: Tuesday, July 11, 2006 7:31 PM
Subject: Re: [cisco-voip] VG248 constantly rebooting

what sort of call volume are you running through that one?  there is  
an issue with resource utilization in all 1.3(1) code where a busy  
system will reboot CSCsa68044.  mostly observed when calls are  
delivered in rapid succession to the same port on the vg248.

otherwise, vg248 only generates a 'cold boot' snmp trap.  syslog  
contains all the same things as the event viewer.

/Wes

On Jul 11, 2006, at 10:19 AM, Lelio Fulgenzi wrote:

We are having a problem where one of our VG248s is sometimes  
constantly, sometimes occassionaly rebooting. We have replaced it  
twice and have swapped the UPS but troubles still persist.

The logs don't show much and we're not sure what the problem might  
be. We're guessing it's one of the devices attached to the switch and  
we have a few leads, but I'm wondering if anyone out there has run  
into a problem where a device was causing the unit to reload. We have  
another VG248 with the same code and types of devices plugged into  
the same UPS so we're pretty sure it's an end device.

Also, is there any extra information contained in the SNMP traps and  
SYSLOG?

What was curious, and what we are investigating are three ports that  
register off-hook but the status says call ended on the next screen.

------------------------------------------------------------------------ 
--------
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"I can eat fifty eggs." "Nobody can eat fifty eggs."
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