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

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@5497 f38db490-d61c-443f-a65b-d21fe96a405b
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kpfleming 2005-04-22 04:39:41 +00:00
parent ea12ee2c58
commit 77ac34c066
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
Those using SIP phones should be aware the Asterisk is sensitive to large
jumps in time. Those who live in areas that are on Daylight Savings Time (or
equivalent) should set their system and hardware clocks to use UTC in order
to avoid any possible jumps in system time. There should be no noticeable
effects to the user, as you should still set your system to use the local
offset from UTC.
Those using SIP phones should be aware the Asterisk is sensitive to
large jumps in time. Manually changing the system time using date(1)
(or other similar commands) may cause SIP registrations and other
internal processes to fail. If your system cannot keep accurate time
by itself use NTP (http://www.ntp.org/) to keep the system clock
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
if the administrator makes large manual time adjustments. Thus, it is good
practice to keep the time on your Asterisk server synced to a reliable
source, such as an NTP server.
Apparent time changes due to daylight savings time are just that,
apparent. The use of daylight savings time in a Linux system is
purely a user interface issue and does not affect the operation of the
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
is known to at least affect SIP registrations.
Also note that this issue is separate from the clocking of TDM
channels, and is known to at least affect SIP registrations.
* MORE INFORMATION