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more clarification of time changes and how they affect Asterisk (bug #4020)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5497 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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Kevin P. Fleming
2005-04-22 04:39:41 +00:00
parent c2ef8373c7
commit e1dec7cda6
1 changed files with 19 additions and 12 deletions
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@@ -164,20 +164,27 @@ from the variables specified above.
* SPECIAL NOTE ON TIME * SPECIAL NOTE ON TIME
Those using SIP phones should be aware the Asterisk is sensitive to large Those using SIP phones should be aware the Asterisk is sensitive to
jumps in time. Those who live in areas that are on Daylight Savings Time (or large jumps in time. Manually changing the system time using date(1)
equivalent) should set their system and hardware clocks to use UTC in order (or other similar commands) may cause SIP registrations and other
to avoid any possible jumps in system time. There should be no noticeable internal processes to fail. If your system cannot keep accurate time
effects to the user, as you should still set your system to use the local by itself use NTP (http://www.ntp.org/) to keep the system clock
offset from UTC. synchronized to "real time". NTP is designed to keep the system clock
synchronized by speeding up or slowing down the system clock until it
is synchronized to "real time" rather than by jumping the time and
causing discontinuities. Most Linux distributions include precompiled
versions of NTP. Beware of some time synchronization methods that get
the correct real time periodically and then manually set the system
clock.
Even for those who don't live in DST zones, this issue may manifest itself Apparent time changes due to daylight savings time are just that,
if the administrator makes large manual time adjustments. Thus, it is good apparent. The use of daylight savings time in a Linux system is
practice to keep the time on your Asterisk server synced to a reliable purely a user interface issue and does not affect the operation of the
source, such as an NTP server. Linux kernel or Asterisk. The system clock on Linux kernels operates
on UTC. UTC does not use daylight savings time.
Also note that this issue is separate from the clocking of TDM channels, and Also note that this issue is separate from the clocking of TDM
is known to at least affect SIP registrations. channels, and is known to at least affect SIP registrations.
* MORE INFORMATION * MORE INFORMATION