[cisco-voip] Phones displaying CM Down during calls.

[Matt OLIVER]

There as a WAN in between.
 
We have about 600 users in the building spread across 6 floors and 4
VLANs. Each VLAN is a /24 subnet and consists of 4x3560-48 switches
cabled back via copper GBIC's to the 6509 core switches. We use spanning
tree costs to send traffic in the data VLAN to core switch 1 and Voice
vlan to core switch 2.
The two core switches are connected via a 4Gb EtherChannel, and both
have fibre WAN connections through the interfaces on the SUP cards out
to the WAN. 
The fault has so far only occurred on one VLAN. 
We have about 12 other sites that also connect over the WAN to the same
Call Manager and none of these have experienced any similar faults. It
is quite literally limited to one VLAN within one building. 
 
Thanks Matt

________________________________

From: Leonardo D'Urso [mailto:l.durso at gmail.com] 
Sent: Thursday, 13 December 2007 21:58
To: Matt OLIVER
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Phones displaying CM Down during calls.


Hi Matt

the phones and the callmanager servers are in the same building or there
is a WAN connection between?

regards
Leonardo



2007/12/13, Matt OLIVER < Matt.Oliver at team.telstraclear.co.nz
<mailto:Matt.Oliver at team.telstraclear.co.nz> >: 

	Hi there, 
	I have a number of phones  (20 out of 192 in one VLAN) that are
coming up with CM Down during calls. I know that this is caused through
the phone being unable to talk to the call manager via skinny, however
we are having no phones rehome to other Call Managers, and in the
particular building we have 600+ users and this is only affecting 20
users all of whom are in the same VLAN.
	The VLAN configs are all the same and deployed in the same
manner across 8500 phones. There are 4x 3560-48 switches in the affected
VLAN. 
	These connect via GBIC uplink ports to redundant 6509 core
switches.
	 
	We are seeing no errors on the WAN, or interfaces, in fact the
only please the error is seen is on the phones themselves, and it is
intermittent. The IOS version is 12.2(25)sec which again has been
deployed on over 400 of these in the network.
	It seems link only skinny is affected, the users are not
complaining of data errors and the calls are not being cut off, although
the caller is reporting hearing a loud noise when it happens.
	 
	I have seen a few other threads that mention a similar error,
however I cant seem to find any answers on this.   Any ideas would be
greatly appreciated.
	 
	 
	Regards Matt
	 
	 
	 

	

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