[Asterisk-Users] YET Another echo issue PRI CARD Any help accepted :-)

[jjones at quiddesign.com]

Couple thoughts.

first - I hope you have reversed your files listed and zaptel is  
really zapata and vice versa

second - always stop and start * when making changes to zapata -  
reload does not cut it - (some experience here)

third - I wound up with a fairly echo free system using the software  
echo cancel within * but it was not good enough for a commercial  
application. I opted out for hardware echo cancelling via DSP and  
spent the bucks. They have been very good and I was able to turn off  
on * and reduce its load.

My largest intermittant source of echo was traceable to various LEC/ 
IXC who were clueless on proper installation procedures. I was able  
to work with some to remedy but having them keep popping up and  
receiving customer complaints made it worth spending the $$$.

good luck


On May 26, 2005, at 12:14 PM, Ronald Hartmann wrote:

> Good Day all,
>
>     I have a Fractional PRI connected to my Asterisk Box via a T100P
> card.
>
>     When I initiate a call out to phone number 123-8888 the call
> sounds great no echo what so ever.
>
>     If the person at 123-8888 hangs up and calls me right back (same
> handset on both sides) same trunk line
>     The call always has echo on it.  The Asterisk sip extension
> hears them selves echoing.  The remote party does not notice any
> difference.
>
>     I have tried all the following.
>
>        #define CONFIG_ZAPTEL_MMX  <tried this defined and undefined>
>
>     Then tried each of the following types of echo cancellations.
>
>        #define ECHO_CAN_MARK
>        #define ECHO_CAN_MARK2 with and without #define
> AGGRESSIVE_SUPPRESSOR
>        #define ECHO_CAN_MARK3
>
> I am completely at a loss on how to get rid of this echo problem. The
> system is completely useless for incoming calls, as it currently  
> stands.
> Is there a Digium card that handles echo better? Are there any  
> asterisk
> compatible cards with hardware echo cancellation available?
>
> Thanks
>
> Ron
>
>     [Zapata.conf]
>        span=1,1,0,esf,b8zs
>        bchan=19-23 # set this to 1-15,17-31 for E1
>        dchan=24 # set this to 16 for E1
>
>        defaultzone=us
>        loadzone=us
>
>     [Zaptel.conf]
> [channels]
> language=en
>
> signalling=pri_cpe
> switchtype=national
> pridialplan=unknown
> echocancel=yes
> echocancelwhenbridged=yes (tried no)
> echotraining=400 (tried 800 also)
> usecallerid=yes
> callerid=asreceived
> overlapdial=yes
> immediate=no
> group=0,1
> context=from-pstn
> channel => 19-23
>
>
>
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