[Asterisk-bsd] Timing issues

[Richard Neese]

cd /usr/loca/etc/rc.d
and add ztdummy.ko to the end of the module load line and to the begining of 
the unload line. this wuill enable ztdummy for timing.

On Sunday 08 July 2007 07:42:17 am Roland Giesler wrote:
> Dear list,
>
> We are running FreeBSD 6.2 with Asterisk 1.4.5 (that has been built
> with threading in the IAX2 channel removed due to the threading bug in
> it).  Codec in use before today has been G.729, but we were not able
> to get chanspy to work without crashing Asterisk (persistently).  So
> we switched to G.711, which does not crash asterisk when chanspy is
> used.  We don't wish to stay with G.711 however, since our VoIP
> service provider only support G.729 and thus we want to run G.729 over
> the whole network eventually again (all links from the phone, Asterisk
> (PBX01), wan link, Asterisk (Vrouter) to VoIP SP).
>
> The biggest problem, however, seems to be a timing issue.  This is what
> happens: We record all calls in Asterisk, but when the recording of a poor
> call (breaking up, bouncing sound, etc) is listened to afterwards, the
> quality is good.  This, in our minds, points to timing issues, not
> codec translation (which is from G.711 to G.729 and finally to GSM
> when the call is placed to mobile phones).  Strangely enough, the
> calls to GSM users sound poor when in progress, but the recordings are
> of acceptable quality.  Calls to landline numbers though, sound
> excellent and recordings are just as good.  That seems to indicate
> that the timing issues are not just confined to our network, but it's
> may be a combination of our and the SP's network and GSM related (if
> doesn't make sense though, or does it - that the codec affect the
> timing?).  Having said that, however, I'm must confess that I'm not
> the technical guru that can qualify this suspicion, and I may be wrong
> in my analysis of the scenario.
>
> How can we address these issues?
>
> Are they timing issues, or could it be something else?
>
> Are there timing issues in general in Asterisk/FreeBSD if we do not
> use any zaptel hardware?   (We don't have any legacy PBX or Telco
> integration or hardware in our Asterisk installation, only ethernet)
>
> regards