[Freeswitch-users] Conference timer synchronization with T1 FreeTDM - how?

[Michael Jerris]

There are buffers in here… so as long as we are always a chunk ahead in the conference, the timer accuracy shouldn't matter unless there is drift over time.  The only way it would cause distortion would be if there was not a packet ready to write to the t1 when it needed.  How frequent are the blips, and are they at a fairly regular schedule?  

On Sep 25, 2013, at 5:36 AM, Bob Hartwig <bobjectsfreeswitch at gmail.com> wrote:

> Hello Anthony,
> 
> On Tue, Sep 24, 2013 at 11:45 PM, Anthony Minessale <anthony.minessale at gmail.com> wrote:
> You could test your theory more by making an extension like this:
> 
>     <extension name="test">
>       <condition field="destination_number" expression="^1234$">
>         <action application="answer"/>
>         <action application="set" data="time_name=soft"/>
>         <action application="playback" data="tone_stream://%(251,0,1004);loops=-1"/>
>       </condition>
>     </extension>
> 
> 
> This would produce a timer and use it for playback instead of the read stream.
> 
> 
> Yes, I did just that yesterday, and the playback is similarly distorted then.  That experiment is what made me pretty certain that the mod_conference timer was my culprit.
> 
> 
>  
> If you wanted to make a timer you could use from the TDM you would have to make a FS module with raw dahdi code in it that opened a socket and clocked off of it and pushed it out to the channels like how some of the other timer modules do but I think if you are on a modern kernel with timerfd that this should not be necessary.  If you are on an older platform like centos5 you could try the old -heavy-timer command line arg.
> 
> 
> -heavy-timer is new to me, thanks for the tip.  My problem is not timer accuracy, but timer synchronization with the T1 clock.  But grepping for heavy-timer may give me some insight on how to replace the main timer if it turns out that I need to go that way.
> 
>     Thanks,
>     Bob

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