[asterisk-ss7] echo on a SS7/E1

[Jorge Antillon]

Is there not a different way to do that, ie:

echocancel=31speech or
echocancel=always

combined with:

echocan_taps=32

echocan_train=350


Is chan_ss7 using your VPMADT032 at all?

How do you tell whether you are using s/w echo or the hardware module?

jorge.


> 
> 
> Hello
> 
> 
> I have the following setup:
> 
> 
> Ast1.6.1.18+Chan-SS7  1.3 --> TE221 Board + VPMADT032 hw echo
> canceller  --> E1 to Mobile MSC E/// AXE10
> 
> 
> I assume the hardware module is detected as the following message
> appears:
> wcte12xp: VPM present and operational (Firmware version 117)
> 
> 
> Calls are initiated via a SIP Client with G729, codec available on the
> server.
> 
> 
> On most of the calls, the quality is crystal clear - however, on some
> specific numbers, there is a huge echo perceived on the SIP client. 
> 
> 
> This happens to some specific numbers, though 99%+ of the calls are ok
> - all these numbers (with or without echo) are served by the same E1,
> so nothing changes on my side. I am connected to a mobile GSM
> operator, when I call this number from one of their cellphones, there
> is no echo...
> 
> 
> 
> 
> Any suggestions as what to check ?
> 
> 
> Many thanks, 
> 
> 
> J.
> 
> 
> 
> 
> 
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