[cisco-voip] 7912/05/02 issue..

[Robert Singleton]

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