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

[jjones at quiddesign.com]

Since I have had multiple requests I am posting my supplier here.  
Hope this is not off topic but they really helped me out and others  
seem to be interested.

Vendor = ditech communications
Product I used was their Quad 2 T1, link is below

http://www.ditechcom.com/platforms/tdmEchoCancellers.html

you may contact the salesman I used at ddingwall at ditechcom.com

On May 26, 2005, at 4:13 PM, jjones at quiddesign.com wrote:

> 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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>>
>
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