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author | russell <russell@f38db490-d61c-443f-a65b-d21fe96a405b> | 2005-05-10 04:09:21 +0000 |
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committer | russell <russell@f38db490-d61c-443f-a65b-d21fe96a405b> | 2005-05-10 04:09:21 +0000 |
commit | 8839dea79b550fef27a298ccc381edb5787d0af0 (patch) | |
tree | d6ce573f0ddae31c71b1daa7d1cfa6b1e9b4250b /README | |
parent | 427600163da752998fe51519bb313316bbbd4ef9 (diff) |
add note about the effects of time changes (bug #4020)
git-svn-id: http://svn.digium.com/svn/asterisk/branches/v1-0@5617 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'README')
-rwxr-xr-x | README | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -136,6 +136,30 @@ parameters. For example, the line "channel => 25-47" creates objects for the channels 25 through 47 of the tormenta card, obtaining the settings 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. 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. + + 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. + * MORE INFORMATION See the doc directory for more documentation. |