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Cisco Unified Communications Manager Express

Field Notice: FN - 62686 - U.S. Daylight Saving Time (DST) Policy Changes Effective March 2007 - Cisco CallManager Express (CCME)


Revised April 05, 2007

February 19, 2007

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Products Affected

CCME - All

Problem Description

New U.S. Daylight Saving Time rules go into effect in March 2007.

For CCME systems that have not been updated with the new U.S. DST policy changes, timestamps will exhibit a one hour time clock offset lasting three weeks beginning at 2 A.M. on the second Sunday in March of 2007. They will also exhibit a one hour time clock offset lasting one week beginning at 2 A.M. on the first Sunday in November.

Background

On August 8, 2005, the Energy Policy Act of 2005 (H.R.6.ENR), was signed into law. Section 110 of this Act modified the time change dates for Daylight Saving Time (DST) in the U.S.

Beginning in March of 2007, DST will begin on the second Sunday of March and end the first Sunday of November.

For 2007 and beyond, the daylight saving time period will be:

2:00 A.M. on the second Sunday in March

to

2:00 A.M. on the first Sunday in November

For more information on the Energy Policy Act of 2005 please see H.R. 6. (See Section 110)

Problem Symptoms

IP Phones connected to the CCME system and Call Detail Records (CDR) get their time based on the time setting in IOS on the CCME Router. To show the correct time when DST changes in March and November 2007, the correct dates need to be specified on a yearly basis if your area changes time for DST.

Networking systems often make use of local time to mark logs, as well as to schedule certain events, such as IP SLA schedule starts, or the beginning or end of a time-based access-list.

In addition, inconsistencies between time zone definitions may impact event correlation systems as well as other management systems relating to problem escalation. Having accurately represented local time is a very big concern for most organizations. Local time may be reflected in logs and on phone displays. This is especially true of systems that require accurate time and time stamping for proper operations.

For networking systems, the clock or clock source is often derived from a trusted chronological source such as a private or public Atomic clock, often through Network Time Protocol (NTP). NTP communicates time in Coordinated Universal Time (UTC), colloquially known as GMT, and thus is not impacted, nor is a workaround for statutory time zone changes. Local time definitions, including summertime settings are part of the configuration of most Cisco products.

Workaround/Solution

Cisco CallManager Express is an IOS based application. Thus, the Daylight Saving Time Configuration parameters for a system running IOS can be easily changed with a single configuration command. This command can be run at any time and on any device to alter the current default settings of the given device.

clock summer-time zone recurring [week day month hh:mm week day month hh:mm [offset]]

For example, to configure the new settings for DST in calendar year 2007, one can enter the following command:

clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00

Customers who are using the following Cisco Unified IP phone models:

7905

7912

7920

7921

7935

7936

7940

7960

are required to set the time and correct DST dates in Cisco IOS on the CCME router and do not need to upgrade phone firmware. Set the correct start and stop dates for this year DST in IOS by following the procedure above.

Customers who are using the following Cisco Unified IP phone models:

7906

7911

7931

7941

7961

7970

7971-GE

are required to upgrade to the following phone firmware to display the correct time:

* CCME 3.X, 4.0 and 4.0(x) customers need to upgrade the phone load to 8.0(4)SR2.

* CCME 4.1 and 7931 customers need to upgrade the phone load to 8.2(2)SR1.

Phone loads can be down loaded from the Cisco Unified CallManager Express and SRST Software Download (registered customers only) page.

* Customers who are using the Cisco IP Communicator (CIPC) are required to upgrade the CIPC version 2.0(2).

The reason for different procedures for the different phone types is because the new phones maintain an internal calendar and dates for Daylight Saving Time.

For more information on the phones, see FN - 62666 - US Daylight Savings Time Policy Change Effective March 2007 - for Cisco Unified IP Phones 7900 Series.

For more information on IOS, see FN - 62613 - U.S. Daylight Savings Time Policy Changes Effective March 2007 - for Cisco IOS Software.

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCse78963 (registered customers only)

adopt new default summer-time rules from EPA BADCODE FIX

Revision History

Revision

Date

Comment

1.4

05-APR-2007

Updated Workaround/Solution section for new SW phone load - CCME 4.1 and 7931 customers need to upgrade the phone load to 8.2(2)SR1.

1.3

19-MAR-2007

Updated Workaround/Solution section - revised phone load version - "CCME 3.X, 4.0 and 4.0(x) customers need to upgrade the phone load to 8.0(4)SR2". Revised note for phone load 8.2(1) - added "7931 customers". Added download link for phone loads.

1.2

09-MAR-2007

Workaround section updated to include CCME 3.X in available phone firmwares.

1.1

27-FEB-2007

Corrected phone load version for CCME 4.1 in Workaround/Solution section - changed from 8.3(1) to 8.2(1).

1.0

19-FEB-2007

Initial Public Release

For More Information

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