Hi, The echo problem is the X100P. The hybrid is 'unbalanced', and basically what happens is that the outgoing sound signal comes right-on back as an incoming signal. The reason you don't notice it using the TDM400P is that the incoming sound is completely 'in-sync' with you talking through the handset. The signal is 'bridged' in the computer, and there is (basically) zero delay. Now, when using the X-Lite, the softphone has to do 'some' processing to get the signal coming in to the wires (X100P) to your computer speakers. This processing introduces delay (latency). Now, you here your voice (outgoing signal, being 'turned-around' at the X100P phoneline interface) coming back at you, but with a more noticable delay. Hence the echo. The same effect also occurs when using SIP hardphones connected to [*] and calling out over the X100P. The solution is to implement a 'hybrid balancing' function at the X100P interface. Traditioinally for FXO this has been done in hardware (not flexible) or more recently in software using embedded DSP chips providing adaptive real-time hybrid balancing. The DSP algorithms are not very complex, and could conceivibly be run on the [*] main processor. I have not looked into the codebase, however. For a system with only a few FXOs it should not be a real problem. Notice, that a T1 interface is digital, and you do not have this 'turn-around' issue. Without looing at the Plantronics design specs, there is no telling whether it would work. In any case, the real answer is to fix the problem right at the X100P interface. Cheers, Willy
----- Original Message Follows ----- > Hello all, > > I'm thinking about getting the Plantronics DSP-400 headset > for use with Xlite softphone. I currently have a "analog" > headset that does NOT have a DSP on board, which gives me > mediocre call quality and echo when talking to the PSTN > thru my X100P card. I have zero echo when talking thru my > X100P on my cordless phones attached to the Digium > TDM400P. > > Before I got spend the money I was wondering if others > using USB headsets with a DSP and getting good results? > My thought was thought by using a headset with a DSP on > board the echo would go away? > > Any advice on which USB headset in general to use with a > softphone? > > Thanks in advance, > Ed Rubright > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users Willy Wouters ypOne Publishing _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
