# Asterisk timing source?

**URL:** <https://community.asterisk.org/t/asterisk-timing-source/41329>\
**Category:** Asterisk Support\
**Created:** [December 13, 2012, 9:13am UTC](https://community.asterisk.org/t/asterisk-timing-source/41329 "2012-12-13T09:13:56Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![pranav](https://avatars.discourse-cdn.com/v4/letter/p/a4c791/32.png) [@pranav](https://community.asterisk.org/u/pranav)\
**Post date:** [December 13, 2012, 9:13am UTC](https://community.asterisk.org/t/asterisk-timing-source/41329/1 "2012-12-13T09:13:56Z")

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hi all

I am using currently CentOs 5.4 as opertating system and Asterisk® Open Source PBX asterisk 1.6.2.6.  
I wan to know by default what is the timing source used by asterisk ? and what is the timing source used by asterisk when asterisk.conf  
"internal\_timing = yes" is set

I am also not able to build resource module res\_timerfd

please guide me thanks in advance

pranav

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**Author:** ![david55](https://avatars.discourse-cdn.com/v4/letter/d/e19adc/32.png) [@david55](https://community.asterisk.org/u/david55)\
**Post date:** [December 13, 2012, 11:08am UTC](https://community.asterisk.org/t/asterisk-timing-source/41329/2 "2012-12-13T11:08:37Z")

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Why are you using such an obsolete version? I’m not sure if that version supports res\_timerfd, but, if it does, the implementation will be buggy. With that version, you should be using dahdi as your timing source.

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**Author:** ![pranav](https://avatars.discourse-cdn.com/v4/letter/p/a4c791/32.png) [@pranav](https://community.asterisk.org/u/pranav)\
**Post date:** [December 13, 2012, 11:35am UTC](https://community.asterisk.org/t/asterisk-timing-source/41329/3 "2012-12-13T11:35:41Z")

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Thanks david  
just one more thing timing\_pthread can be buggy in this version ? and is it bad to use timing\_pthread as timing source?

thanks in advance  
pranav

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**Author:** ![david55](https://avatars.discourse-cdn.com/v4/letter/d/e19adc/32.png) [@david55](https://community.asterisk.org/u/david55)\
**Post date:** [December 13, 2012, 11:54am UTC](https://community.asterisk.org/t/asterisk-timing-source/41329/4 "2012-12-13T11:54:46Z")

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It is OK to use pthread timing in current versions. 1.6.2.6 is not a current version.