[asterisk-users] Best timing source?

Duncan Turnbull duncan at e-simple.co.nz
Wed Apr 6 14:39:45 CDT 2016

> On 7/04/2016, at 6:01 AM, Carlos Chavez <cursor at telecomabmex.com> wrote:
>> On 4/5/16 3:17 PM, Joshua Colp wrote:
>> Carlos Chavez wrote:
>>> I am currently having a voice quality problem with one of our Asterisk
>>> servers. We have checked the network and we have found no problems that
>>> could cause the voice to sound cracked and with small interruptions. I
>>> am looking at the timing source for Asterisk and it is currently using
>>> timerfd even though we have an E1 card installed. Is timerfd better than
>>> dahdi? Any recommendations to test if timing may be a problem for voice
>>> quality and DTMF?
>> What is the scenario and the channels involved? Timing is only used
>> for things such as playback, music on hold, and ConfBridge. If it's
>> strictly a two party call then Asterisk forwards media as received.
>    I am starting to think that the problem may be in the server hardware itself.  We are using a Dell R220 with 8gb of ram and 2 hard disks in a Raid 1 configuration (Linux Raid).  We are using CentOS 7.  We had to remove the raid card from the server to install an E1 card (the raid card was Windows only so no loss there really).  Internally everything sounds good (from E1 to a conference or music) but once you hit a network interface we start getting pops and drops.
>    Anyone with this server and Asterisk ever had issues like these?
Just checking you have your E1 timing set to slave off the upstream. If not you are going to have E1 sync errors which will give you the voice problems you describe

> -- 
> Telecomunicaciones Abiertas de México S.A. de C.V.
> Carlos Chávez
> +52 (55)9116-91161
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