All : many thanks for your replies - I havent replied before as I was trying to get an environment where I can reproduce this echo. Only some progress so far. A few questions re your comments: - is there a way to disable via software the VPM module ? I take the suggestion of removing physically the board as interesting, unfortunately, the server is in a remote location with strict access conditions... if it could be done by software, that would be great - I've upgraded to the latest dahdi (2.3.0) tonight, I will see if there are any improvements - regarding echowhenbridge, echocancel, etc... do these parameters apply to hardware echo canceller as well ? my understanding was this applied only to software EC - does anyone has a proper doc for this module ? Many thanks for your precious help, J. On Thu, Apr 1, 2010 at 7:07 PM, John Bigelow <jbigelow at digium.com> wrote: > I suggest to also upgrade DAHDI to the latest version which contains > newer firmware for the VPMADT032. > > -John > > Jean C?rien wrote: > > > > 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. > > > > > > -- > _____________________________________________________________________ > -- 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/20100415/1dec9c83/attachment.htm
|