[cisco-voip] Time on Phones

[Reuben Farrelly]

On a slightly related note, I have very recently logged a bug with Cisco in 
regards to broken NTP support in the SIP firmware for the IP phones beginning in 
8.3(2) onwards.

The response has been to acknowledge that Yes, NTP is broken (CSCso40588), but 
No, they will not fix it as the correct Date/Time should fail over to using the 
Date: header from the SIP/CallManager server - and if your CCM has the wrong 
time, so will all the phones.

This is a fallback position given the NTP is not functional, but in a normal CCM 
environment should be OK.  It is all documented at:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/5_1_3/ccmcfg/b02ntpsv.pdf

In light of that I would *not* recommend relying on NTP on phones running later 
versions of firmware.

The server side however is a different matter - and yes, certainly should be set 
to sync to an accurate NTP server.   Remember that NTP works in UTC though, it's 
timezone independent, and the Date: header in the SIP control is also in UTC 
(only) :-)   So the OP's issue MAY well come back to upgrading firmware on 
handsets.................

Reuben



On 6:59 AM, Jorge L. Rodriguez Aguila wrote:
> Star by checking what version of CCM OS you are running. If you are up 
> to date, you should already be running the latest fixes for the DST 
> changes that happened last year(or was it the one before). Also Consider 
> that Indiana, or is it Indianapolis only I am not sure, does not observe 
> DST so you should check whether your server is running with the DST flag 
> on or off.
> 
> If you are not running the latest version of OS code for your server you 
> might have to either update your OS or run the DST patches or both in 
> the DST patch first and the OS update second order. In addition, are you 
> running of an NTP or are you manually adjusting your Time? If you are 
> not running NTP then I suggest you switch to one.