[cisco-voip] Fwd: NTP Reference for IP Phones

[Ryan Ratliff]

It's intended for phones that support NTP to allow them to sync  
directly to the NTP server and not have to rely on CUCM.  In the  
implementation however even the phones that support NTP will take  
their time from CUCM over any configured NTP server.

Both models you noted below do not support external NTP and will take  
their time directly from CUCM, which means you need to get a version  
of CUCM with the current DST date for Brazil, if it exists.

-Ryan

On Feb 18, 2009, at 10:01 AM, Marcelo Zilio wrote:

Thank you for your reply,

Some 7960 with 8.0(7.0)
Some 7912 with 8.0.2(060817A)

I've changed Time Zone in Date/Time Group Configuration and now  
phones are showing correct time, but I think this is not the correct  
behavior...

Just another question. You said some phones get their time from CUCM,  
so what is the meaning of the "Phone NTP Reference" under System menu?

thank you
Marcelo

2009/2/17 Ryan Ratliff <rratliff at cisco.com>
You need to be more specific on your phone model and version.  The  
3rd gen phones (79x1, 79x2, 79x5, 7970) do their own DST  
calculations.  The other phones get their time directly from CUCM.

If your phone or CUCM isn't updating the time correctly then you need  
to set the date/time group to let them have the right time manually.

-Ryan


On Feb 17, 2009, at 7:13 AM, Marcelo Zilio wrote:


Someone? Please...



---------- Forwarded message ----------
From: Marcelo Zilio <ziliomarcelo at gmail.com>
Date: 2009/2/16
Subject: NTP Reference for IP Phones
To: cisco-voip at puck.nether.net


I'm having some troubles because daylight saving time in Brazil.
Last weekend we got back to "normal" time and every host in the  
network update clock fine but the phones.
Phone NTP reference is configured OK, CallManager clock is OK.

I've searched for some patch but I think Cisco doesn't release this  
kind of patches for Brazil.

My NTP Server is a 2801 router. Is there some way to know if the  
phones are really looking for a NTP server or they just have a  
"cache" hour?

CallManager version is 5.1.3
Firmware version 8.0

Thanks,
Marcelo

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