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Home > Archive > Voice over IP Cisco > April 2006 > 7912/05/02 issue..
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7912/05/02 issue..
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| Jim McBurnett 2006-04-20, 6:57 pm |
| All,
I was wondering about a specific problem I saw.
Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.
This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-a...?case=K13013165
Since the 7911 has more memory and features, is it the answer to this
issue?
Anyone have a thought on this?
Tks,
Jim
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| Carter, Bill 2006-04-20, 6:57 pm |
| The primary cause of this problem is the phones 3 port Ethernet switch
was software based on these models. The 7912G-A converted to a hardware
based switch like the 7940G and 7960G. I don't know the answer on the
7911G, but I would assume cisco wouldn't make this mistake again.
-----Original Message-----
From: cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] On Behalf Of Jim McBurnett
Sent: Thursday, April 20, 2006 8:00 AM
To: cisco-voip@puck.nether.net
Subject: [cisco-voip] 7912/05/02 issue..
All,
I was wondering about a specific problem I saw.
Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.
This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-a...?case=K13013165
Since the 7911 has more memory and features, is it the answer to this
issue?
Anyone have a thought on this?
Tks,
Jim
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| |
| Robert Singleton 2006-04-20, 6:57 pm |
| On Thu, 2006-04-20 at 15:18 -0500, Carter, Bill wrote:
> The primary cause of this problem is the phones 3 port Ethernet switch
> was software based on these models. The 7912G-A converted to a hardware
> based switch like the 7940G and 7960G.
In a related issue, I have some 79[46]0 phones that seem to momentarily
lose the user access port very briefly under some reset conditions.
Sometimes, it's as simple as making a small change to the phone that
requires a soft reset. More critical issues occur when the phone loses
contact with CallManager and keeps trying to re-home.
We are a wholesale supplier and our typical branch office is designed,
quite intentionally, to not be brought completely down by a loss of the
T1 to corporate. All sales and inventory functions take place on the
local printer. If we lose connectivity to corporate, we lose telephones,
but business marches on unaffected.
Well, except that whenever an IP phone is attempting to rehome to the
CallManager (which is at corporate), it will reboot. During this reboot,
there is enough interruption of the swiched traffic through the phone to
disrupt the telnet or ssh connection from the user's PC to the local
server.
Worse, not all phones do this and even the ones that do, don't seem to
do it every time they lose connectivity to CallManager.
Any ideas?
Robert
| |
| Jim McBurnett 2006-04-20, 6:57 pm |
| Great news.....
I wonder if this is a smartnet replaceable issue...
Later,
Jim
-----Original Message-----
From: Carter, Bill [mailto:bcarter@sentinel.com]
Sent: Thursday, April 20, 2006 4:19 PM
To: Jim McBurnett; cisco-voip@puck.nether.net
Subject: RE: [cisco-voip] 7912/05/02 issue..
The primary cause of this problem is the phones 3 port Ethernet switch
was software based on these models. The 7912G-A converted to a hardware
based switch like the 7940G and 7960G. I don't know the answer on the
7911G, but I would assume cisco wouldn't make this mistake again.
-----Original Message-----
From: cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] On Behalf Of Jim McBurnett
Sent: Thursday, April 20, 2006 8:00 AM
To: cisco-voip@puck.nether.net
Subject: [cisco-voip] 7912/05/02 issue..
All,
I was wondering about a specific problem I saw.
Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.
This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-a...?case=K13013165
Since the 7911 has more memory and features, is it the answer to this
issue?
Anyone have a thought on this?
Tks,
Jim
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
This email may contain proprietary and confidential information for the
sole use of the intended recipient.
Any review, retransmission, dissemination, or other use of this
information by persons or entities other than the intended recipient is
prohibited. If you are not the intended recipient, please contact the
sender and delete all copies. To the extent that opinions are expressed
in this message, they are not necessarily the opinions of Sentinel
Technologies or any of its affiliates, employees, directors, officers or
shareholders.
| |
| Erick Bergquist 2006-04-24, 7:58 am |
| I have seen this on some networks. Try to clean up the network as best as you can and reduce un-needed traffic to phones.
Also, with these model phones having the switchports going to phones configured as access mode with voice vlan works better then switchport configured as a trunk going to a phone from my run ins with this problem. There was a recent thread heavilly discus
sing the switchport config for phone connections.
----- Original Message ----
From: Jim McBurnett <jim@tgasolutions.com>
To: cisco-voip@puck.nether.net
Sent: Thursday, April 20, 2006 8:00:08 AM
Subject: [cisco-voip] 7912/05/02 issue..
All,
I was wondering about a specific problem I saw.
Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.
This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-a...?case=K13013165
Since the 7911 has more memory and features, is it the answer to this
issue?
Anyone have a thought on this?
Tks,
Jim
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
| |
| Ryan Ratliff 2006-04-27, 6:47 am |
| Those phones (as well as ATAs) are very susceptible to heavy
broadcast traffic. The best thing to do is simply reduce the amount
of packets getting put out the switch port to the phone. If there is
no PC behind the phone make it an access port in the voice vlan. If
there is a PC then make sure only the voice and data vlans are being
passed to the phone by the switch. This is why having them as
access mode with the voice vlan works best. If your switch doesn't
support that configuration then prune the non-voice/data vlans from
the trunk on that port.
It's a design limitation and if you want to swap out all your older
phones for new ones TAC isn't the right place to look. If you can
work out a deal with your partner/account team more power to you but
I'm pretty sure Smartnet doesn't cover hardware upgrades.
-Ryan
On Apr 21, 2006, at 1:18 AM, Erick Bergquist wrote:
I have seen this on some networks. Try to clean up the network as
best as you can and reduce un-needed traffic to phones.
Also, with these model phones having the switchports going to phones
configured as access mode with voice vlan works better then
switchport configured as a trunk going to a phone from my run ins
with this problem. There was a recent thread heavilly discussing the
switchport config for phone connections.
----- Original Message ----
From: Jim McBurnett <jim@tgasolutions.com>
To: cisco-voip@puck.nether.net
Sent: Thursday, April 20, 2006 8:00:08 AM
Subject: [cisco-voip] 7912/05/02 issue..
All,
I was wondering about a specific problem I saw.
Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.
This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-a...?case=K13013165
Since the 7911 has more memory and features, is it the answer to this
issue?
Anyone have a thought on this?
Tks,
Jim
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
________________________________________
_______
cisco-voip mailing list
cisco-voip@puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip
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