[Asterisk-Users] Will Echo problems EVER be solved, I'm scared

[Soner Tari]

>> >> > Is it practical to 'assume' that in your case mentioned above that
>> >> > #1 is not going to occur again (since I assume when you say 'line'
>> >> > you are referring to an outside pstn line), and, #2 is in a mode
>> >> > of fine-tuning the training when in fact you'd really like it to
>> >> > start the coarse-training from scratch?
>> >>
>> >> Thanks Rich for the comments. Obviously you got my point. And I was
>> >> hoping
>> >> that it is possible somehow to do #1 (coarse-training from scratch) 
>> >> after
>> >> a
>> >> PSTN line is transfered to another phone or something very important
>> >> changes
>> >> about a call. But considering how complicated a situation this might 
>> >> be
>> >> (there is music on hold to say the least, or perhaps the transferee 
>> >> may
>> >> reject the call and the call returns to the operator [in which case 
>> >> you
>> >> wouldn't want #1], etc.) I guess this is not a simple task. Anyway, 
>> >> I'll
>> >> keep on watching for a solution.
>> >
>> > The echo canceler preload happens shortly after the analog line is
>> > seized. Since a call transfer does not open/close the pstn line again,
>> > its not going to preload again. However, it should not have to anyway
>> > since there hasn't been any electrical changes there.
>> >
>> > What type of phones are you using internal when you're transferring a
>> > call?
>>
>> The internal phones involved were both analog phones, i.e. Zap channels.
>> This problem happened once in the last 2 days (with KB1), so I'm not too
>> negative.
>
> Are the analog phones connected to a TDM card, channel bank, or what?
>
> cvs head or stable & version?

I have 2x TDM cards (4x FXS + 3x FXO), so all analog phones and pstn lines 
are connected to TDM cards, Rev E/F.

Asterisk CVS-HEAD built by root at asterisk on a i686 running Linux on 
2005-08-19 22:03:57 UTC

That's on an Athlon 2000+, with CentOS 4.1, 2.6.11 kernel.

(I have the monitor recording of that call, and I've listened to it a couple 
of times. When the caller from pstn is talking to the operator [before 
transfer] I can't hear echo, but it's a very short converstion, so now I 
can't be sure %100. But after the transfer I can clearly hear the echo. I 
should catch another case like this.)

Thanks for the splitter answer, btw.