Not too knowledgeable about this topic. However: a) Yes echo cancelling in on for vISDN. As I understand the echo canceller is the zaptel echo canceller. There was some talk of this not being quite good enough and a new echo canceller being built into vISDN at some point in the future. Haven't heard whether this has happened yet or not. So to change parameters for the echo canceller you need to try and change the zaptel echo canceller parameters.
b) The test I believe is not a fair test. The phone should be in another room answered by another person. However when this is done there is still some echo (in my tests with default echo cancellation settings) on Phone A's side but not on phone B's side. In your scenario there will always be echo because the audio is going from the speaker at phone A into both microphones. You may have to make the echo canceller settings to max (256 taps?) to fix echo in this situation. R -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chan Kwang Mien Sent: 13 July 2006 08:31 To: [email protected] Subject: [Visdn-hackers] Queries regarding Echo Cancellation in vISDN Hi, I have a few questions regarding Echo Cancellation in vISDN. a) When I run "visdn_configurator", i noticed the visdn_ec is loaded. Does it mean that Echo Cancellation is activated for vISDN ? b) With visdn_ec loaded, I tested the following scenario : Phone A <------> Asterisk IP PBX <---ISDN ---> Phone B. I called Phone A using Phone B. The call at Phone A is answered by turning on the speaker at Phone A. This is to create echo back to Phone B. I realized that I can hear my voice after a slight delay, i.e. echo when i spoke into Phone B. Does anyone have any idea why I am still getting echo when I have enabled Echo Cancellation in vISDN ? Thank you. Regards, Kwang Mien _______________________________________________ Visdn-hackers mailing list [email protected] https://mailman.uli.it/mailman/listinfo/visdn-hackers _______________________________________________ Visdn-hackers mailing list [email protected] https://mailman.uli.it/mailman/listinfo/visdn-hackers
