[asterisk-ss7] BIG Echo on SS7 channels.

[Jorge Antillon]

Ok,

So!, here is what:
Went ahead and enabled:
echocancel => allways
echocan_train => 100
echocan_taps => 128

on every box, on every link.

Restarted asterisk (by issuing restart now) on every box and all hell
broke loose, calls would come in, PDD was up the roof and then this
error:

transport.c:306 io_enable_echo_cancellation: Unable to enable echo
cancellation on cic 494
transport.c:306 io_enable_echo_cancellation: Unable to enable echo
cancellation on cic 586

and so on for every call that made it here....
there was no audio on the call although the calling party would hear
ringing...

also tried 31speech, all links, restarted, same thing... 

any ideas,

Jorge.

On Wed, 2010-08-11 at 18:40 -0400, Jean Cérien wrote:
>  
> Hi
>  
> I had a similar issue, digium card with echo canceller. I was under
> the impression that the EC was turned on by default, while it actually
> requires explicit activation.
>  
> in ss7.conf :
> 
> ; Echo cancellation
> ; echocancel can be one of: no, 31speech (enable only when
> transmission medium is 3.1Khz speech), allways
> echocancel => allways
> ; echocan_train specifies training period, between 10 to 100 msec
> echocan_train => 100
> ; echocan_taps specifies number of taps, 32, 64, 128 or 256
> echocan_taps => 128
> 
>  
> -- note that allways is spelt with 2 l
>  
> You may search some of my posts on this list archive - I had an issue
> w/ the EC resetting, and some digium staff helped me through this
> list.
>  
> Hope this helps
>  
> J.
> 
> 
>  
> On Wed, Aug 11, 2010 at 5:52 PM, Jorge Antillon
> <jantillon at ticom.co.cr> wrote:
> 
>         Hi,
>         
>         I have echo issues with chan_ss7 1.3, so for one:
>         
>         system.conf
>         
>         span=1,1,0,ccs,hdb3
>         span=2,2,0,ccs,hdb3
>         span=3,3,0,ccs,hdb3
>         span=4,4,0,ccs,hdb3
>         
>         bchan=1-31
>         bchan=32-62
>         bchan=63-93
>         bchan=94-124
>         
>         loadzone        = nl
>         
>         as for chan_dahdi, its blank except for [trunkgrous] and
>         [channels] labels.
>         
>         Now, the echo is very consistent and happens on all five boxes
>         (5boxes x 4 E1s each) , any clues?
>         
>         
>         Jorge Antillon
>         CEO - CTO
>         ticom - Costa Rica Telecom 
>         
>         
>         
>         
>         
>         
>         
>         --
>         _____________________________________________________________________
>         -- Bandwidth and Colocation Provided by
>         http://www.api-digital.com --
>         
>         asterisk-ss7 mailing list
>         To UNSUBSCRIBE or update options visit:
>           http://lists.digium.com/mailman/listinfo/asterisk-ss7
> 
> 
> 
> -- 
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
> 
> asterisk-ss7 mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-ss7
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100812/097b47c3/attachment-0001.htm 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 6120 bytes
Desc: not available
Url : http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100812/097b47c3/attachment-0001.jpeg