[asterisk-dev] Queries regarding Echo Cancellation in Zaptel-1.2.6

[Anton]

Chan, 

You've been given an idea, the rest of your qustions are 
just basic configuration tasks. Read on voip-info.org - 
everything is there and quite easy.

Good luck,
Anton.

On 20 July 2006 13:53, Chan Kwang Mien wrote:
> Hi Paul,
>
> Phone A <--> Asterisk PBX 1 <--> Asterisk PBX 2 <-->
> Phone B
>
> I have 2 questions :
>
> a) Could you enlighten me on how to configure Asterisk to
> use a particular codec ? Do I configure it in the Dial
> command in my dialplan ?
>
> b) Currently, I have an entry in Asterisk PBX 2
>
> 	exten => 890,1,Dial(Zap/1/891)
>
> and an entry in Asterisk PBX1
>
> 	exten => 891,1,Dial(Zap/4)
>
> Could you tell me how to configure the dial plan to have
> "loop" calls ? My understanding is that when Phone B
> calls Phone A, a voice path is created. How would it be
> possible to create a reverse path from Phone A to Phone B
> ?
>
> Thank you.
>
>
> Regards,
> Kwang Mien
>
> > Hi,
> >
> > Chan Kwang Mien wrote:
> > > From the translation table, translating ilbc to lpc10
> > > takes the longest time, about 231.
> > >
> > > Should I configure Asterisk PBX1 to use ibc and
> > > Asterisk PBX2 to use lpc10, so that there would be
> > > translation time incurred for the Echo ?
> >
> > No, just choose a codec with highest cost to convert
> > audio from slin/alaw/ulaw which provided by zaptel. As
> > I understand it should be iLBC.
> >
> > To use multiple translations you should have additional
> > Asterisk box between two existing and have different
> > codecs for Asterisk1 and Asterisk2 to utilize
> > intermediate Asterisk as codec translator.
> >
> > Anyway, additional translation will introduce
> > additional 20-30 ms (due to encoding/decoding).
> >
> > Also, you could make "looped" calls (coming from
> > Asterisk1 to Asterisk2, then from Asterisk2 to
> > Asterisk1, then again to Asterisk2, and so on) where
> > each call direction uses different codec (i.e. call
> > from Asterisk1 to Asterisk2, for example, uses iLBC,
> > from Asterisk2 to Asterisk1 - GSM).
> >
> >
> > WBR,
> > Paul.
> >
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