[cisco-voip] 3rd-gen and newer IP phones 5-10 seconds slow

[Bill Simon]

I'm not aware of any method to direct a SCCP-firmware phone to an NTP 
source.  I have seen the option in the XML config file for a SIP load.

So, no, not trying to circumvent CM as the time source.  I'll check out 
the bug you noted.

Thanks
Bill

Wes Sisk wrote:
> We have had at least one report of this before.  That issue appears 
> associated to CSCsd54013.  I don't necessarily agree with that.
> My recollection (questionable?) of this issue is that when 3rd gen phone 
> are provided NTP server they ignore time from CM.  If the phones cannot 
> sync from NTP source for any reason then they drift.
> 
> Are you attempting to provide NTP source to the phones via any means?
> 
> /Wes
> 
> On Friday, May 08, 2009 5:10:44 PM, Bill Simon <bills at psu.edu> wrote:
>> Running CM 4.1.3 with NTP configured on all servers to sync to two 
>> reliable NTP sources and peer with each other for verification.
>>
>> I run ntpq and check each server and all are synced up.
>>
>> My 7940s and 7960s are right on time.  But newer phones, 7961, 7965 
>> and 7906 are anywhere from 5 to 10 seconds slow.
>>
>> I am aware that older phones used SCCP messages to sync time, and 
>> newer phones appear to use a different method.  SIP firmware loads use 
>> NTP; what do SCCP firmwares use?
>>
>> Even after a **#** reset, the phone's time is lagged.
>>
>> Is this a defect of the Java-based firmware, or do I have another 
>> issue within the system causing the lag in the time displayed on the 
>> newer phones?