[asterisk-users] Full Duplex

[Matthew Fredrickson]

Singer X.J. Wang wrote:
> We've had the same issue. For calls that go between a SIP connection 
> (desktop phones) and Zaptel connections, there was a lot of problems 
> with half duplex. We switched
> from the Digium card to the Sangoma card and the problem went away.

Just for the record, he said that it happened regardless of protocol (IP 
to IP calls do not use the card based echo cancellers).

Sorry for the problem you had.  However, I think that if you use a 
current version of our echo canceller board, you will find your issues 
resolved.  In fact, for a significant number of Digium's boards, Sangoma 
uses the exact same hardware echo canceller.

Matthew Fredrickson
Digium, Inc.

> 
> Doug Lytle wrote:
>> Ken Williams wrote:
>>   
>>> We’ve had an issue since we went live nearly two years ago on Asterisk 
>>> where people complain about not being able to talk while someone else 
>>> is talking. I had assumed for a very long time this was because of the 
>>> phones we went live with (Grandstream GXP-2000’s) and for the longest 
>>> time I
>>>
>>>     
>>
>> Sound like your echo canceller is set to aggressive. Make it like a 
>> walky-talky.
>>
>>
>>  From the archives, January 2006:
>>
>> On Friday 20 January 2006 15:36, Ronald Hartmann wrote:
>>
>>   
>>>> Anyone know if it is possible to control how aggressively the
>>>> "Aggressive" mode behaves.
>>>>       
>>>   
>>>     
>>
>> No.
>>
>>
>>   
>>>> I have a situation where Normal echo cancellation is not quite enough,
>>>> however when I turn on aggressive mode
>>>> We are attacking it to hard and I am unhappy with the walkie talkie
>>>> behaviour of the Aggressive mode.
>>>>       
>>>   
>>>     
>>
>> The agressive canceller is agressive because it is designed to turn your voice 
>> channel into a half-duplex (walkie-talkie) communications channel.  You can't 
>> have a "half half duplex" situation.   :-) 
>>
>> Have you tried recent SVN trunk with the MG2 echo canceller?  I have found 
>> that to be the absolute best to date.
>>
>> -A.
>>
>>
>>
>> Doug
>>
>>   
> 
> 
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