asterisk users - Mar 2005 - Zaptel based timing for VoIP-only Asterisk

Hi,

In a VoIP only environment, Asterisk has to use ztdummy 
to have any chance of playing back understandable audio 
files (without drops, hickups etc). 

I have been using ztdummy to some degree of success, but 
I also have a "Wildcard TDM400P REV E/F Board 1" in the 
Asterisk machine I'm using. I'm not using this card for 
anything at all, but I'm wondering how to set it up for 
timing only. What do I have to do (I have no experience 
at all with zap channels and the zaptel.conf file)?

-- 
Andreas Sikkema                Rits tele.com
Van Vollenhovenstraat 3    3016 BE Rotterdam
t: +31 (0)10 2245544  f: +31 (0)10 413 65 45

In article <34F1B1EDB3E7B04C9A282FE3537FC49F141AA6@mail.ritstele.com>,
Andreas Sikkema <andreas.sikkema@ritstele.com>
wrote:
> Hi,
> 
> In a VoIP only environment, Asterisk has to use ztdummy 
> to have any chance of playing back understandable audio 
> files (without drops, hickups etc). 
> 
> I have been using ztdummy to some degree of success, but 
> I also have a "Wildcard TDM400P REV E/F Board 1" in the 
> Asterisk machine I'm using. I'm not using this card for 
> anything at all, but I'm wondering how to set it up for 
> timing only. What do I have to do (I have no experience 
> at all with zap channels and the zaptel.conf file)?
Just make sure the zaptel.conf file is set up correctly for
the combination of FXS/FXO modules you have, and that the
driver is successfully loaded.

Cheers
Tony
-- 
Tony Mountifield
Work: tony@softins.co.uk - http://www.softins.co.uk
Play: tony@mountifield.org - http://tony.mountifield.org

Andreas, 
> -----Original Message-----
> I have been using ztdummy to some degree of success, but 
> I also have a "Wildcard TDM400P REV E/F Board 1" in the 
> Asterisk machine I'm using. I'm not using this card for 
> anything at all, but I'm wondering how to set it up for 
> timing only. What do I have to do (I have no experience 
> at all with zap channels and the zaptel.conf file)?
I'm not sure what would be enough to provide timing, but you can easily try
by accessing a meetme without a timing source :)


- Load the module, test if that is sufficient
- Edit /etc/zaptel.conf to provide info about the card, execute ztcfg and
test again
- Edit zapata.conf to provide info about the card, test again.

I am assuming chan_zap was already built for asterisk, it should do that
automatically when it detects the libraries. You will need to restart
asterisk every step (reloading does not cover Zaptel)

Best regards,
Florian

On 2005-03-29, Andreas Sikkema <andreas.sikkema@ritstele.com>
wrote:
> In a VoIP only environment, Asterisk has to use ztdummy 
> to have any chance of playing back understandable audio 
> files (without drops, hickups etc). 
That brings up a question... on my Alpha, ztdummy is of (apparently)
little use since I have no USB, yet audio sounded fine even before I put
in my X100p card (which now is there solely for timing).

Is that becauze HZ is 1000 instead of 60 on Alpha?

And why does asterisk want ztdummy instead of the more conventional ways
of getting precision timing (RTC, etc)?

-- John