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

[Jason Burns]

If you're really industrious you can download the phone console logs from
the phone web page and search through the logs for any mention of ntp,
drift, or sync.

I would hope the phones print something in there when they sync to an ntp
source.

On Sat, May 9, 2009 at 12:01 AM, Bill Simon <bills at psu.edu> wrote:

> Wait.  Hold up.  NTP servers are in our default options on the DHCP server.
>
> Would it take NTP servers from the DHCP options?
>
> I have never read that the phones do that.
>
> I can try experimenting with the phones' scope in DHCP on Monday if this
> might be it.  Either removing the NTP options or pointing to CUCM...
>
>
> Bill Simon wrote:
>
>> 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?
>>>>
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