[cisco-voip] CME 3.3 and 79xx phones with clock drift

[Ryan Ratliff]

I missed the fact that you are using CME before but the fact remains  
that SCCP phones get their time from CCM/CME.  Stop the router's time  
from drifting and you'll fix the phones.

-Ryan

On Oct 31, 2006, at 9:53 AM, Jason Aarons ((US)) wrote:

Lawrence references SIP with CME 3.3, but I didn't know SIP loads were a
feature of CME.  Perhaps the bug id doesn't match his scenario, that he
is using SCCP 7900s with CME, and needs his router to sync to a NTP
source.

I've never seen SCCP phones drift except when the NTP source that CCM is
using have problems! I once had a server with a bad time clock; the time
would be all over the place, we had to quickly replace it as Kerberos
was freaking out causing people to be unable to login to the domain as
our Domain Controllers pointed to it.


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ryan Ratliff
Sent: Tuesday, October 31, 2006 9:01 AM
To: Lawrence E. Bakst
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CME 3.3 and 79xx phones with clock drift

The phones get the time from CCM.  Pretty much every time you make a
call the time is updated from CCM to the phone so fix the drift on
the CCM and you'll fix the phones.

-Ryan

On Oct 30, 2006, at 8:24 PM, Lawrence E. Bakst wrote:

Is there any way to prevent clock drift with 79xx phone under CME
3.3? My CME router is synced to NTP so the router's time is correct,
but after weeks or months of uptime the clocks on the phones drift. I
am using SCCP but I found the following SIP bug:

CSCef38121: Cisco 79x0: NTP Clock drift on SIP Phones
Symptom: The Cisco 7940/7960 phones exhibit a clock drift issue
Workaround: A phone reset will restart the time clock.

Has this been fixed in any latter versions? Is it too much to ask
that the phones would run NTP? It doesn't seem like they do.

I am running the following loads:
   load 7960-7940 P00306000500
   load 7920 cmterm_7920.4.0-02-01
   load 7970 TERM70.6-0-3SR1S

Best,

leb

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