[Asterisk-Users] Re: Panasonic KX-TD500

[Nenad Radosavljevic]

>
> Hi
>
> I have a connection with Panasonic TDA200.
>
> 1. For echo,,, echocancel=yes, must be before the channel definition of 
> the
> PRI.

I'm very glad if that worked for you, but in case of D500 (connected as 
described in previus messages in this thread), it seems that there is no 
solution for echo problem.
I was even in contact with Digium support and after testing, we came to 
conclusion that calls that are entering Panasonic over a PRI and got picked 
up by any Panasonic Extension and then transfered to Asterisk connected over 
second PRI, are seen by Asterisk as analogue calls (no matter they entered 
Panasonic over PRI and left Panasonic over second PRI and got to Asterisk 
over the PRI :) ). This type of calls, and by my now 6 months expirience 
with asterisk-panasonic D500 hybrid, ONLY this type of calls, always have a 
noticable echo (tested with all different TX and RX leves, all kind of 
echo-cancellation compiled in zaptel drivers, all kind of echocancel, 
echocancelwhenbridged and echotraining settings).

So far no solution for that (except I'm trying to get external hardware 
1xE1/PRI  echo-canceller, to put it in between asterisk and D 500, to see 
will it solve problem :( ).

Regards,
            Nenad