Sound delay in i4b

[Hans Petter Selasky]

Hi,

On Tuesday 16 May 2006 11:19, Dirk Thannhäuser wrote:
> On May 15, 2006, at 2:03 PM, Hans Petter Selasky wrote:
> > On Monday 15 May 2006 12:20, Dirk Thannhäuser wrote:
> >> On May 15, 2006, at 9:38 AM, Hans Petter Selasky wrote:
> >
>
> I played around a lot with changing numbers, but i was not able to
> get latency down.

> Did you ever test with the asterisk echo test application?

Yes, but only "ISDN-NT <-> Asterisk"

> (maybe 
> that latency is only here a problem) 

There is an Asterisk application called MixMonitor, than can be used to record 
calls.

http://www.voip-info.org/wiki/view/MixMonitor

Try recording the call, in .wav format:

exten => ... , MixMonitor(my_file.wav)

Then open up the wave file in a wave-file editor, or send it to me, and try 
measure the echo delay.

> Is it possible that there is a 
> bug inside the application? 

There is a chance that "chan_capi.c" might be adding some extra delay to the 
sound, when it bridges the call. You installed the latest chan_capi also?

> But on the other hand it worked fine with 
> the zaptel drivers.

The zaptel drivers interrupt every millisecond I think, to move data around. 
If you want that low latency, buy a HFC-4S and enable line interconnect in 
'capi.conf'.

> I think i will need more time to study sources :-)

--HPS