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. > >
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