Olivier
2012-Jan-12 12:39 UTC
[asterisk-users] Questions on hardware or software-based echo cancellation
Hi, I'm having some questions related to echo cancellation configuration on a Digium board enabled systems (B410P, TE420, TE420B, ....) for cases when a hardware ech canceller is present or not. I read in TEXXX manual that when setting echocancel=yes in chan_dahdi.conf on a VPMOCT64-equiped system, 128ms hardware echo cancellation was enabled. 1. I'm correct thinking that it is then impossible to switch from hardware to software echo can without removing the VPMOCT64 module itself ? 2. Does the same also apply to HA8 and its VPMOCT032 module ? 3. Are the only options for OSLEC configuration the echocancel=128 or echocancel=256 values in chan_dahdi.conf ? 4. How could be compared user experience with oslec/256, mg2/256, mg2/1024 on a HA8 without hardware module ? Which would you recommend ? Regards
Kevin P. Fleming
2012-Jan-12 22:58 UTC
[asterisk-users] Questions on hardware or software-based echo cancellation
On 01/12/2012 06:39 AM, Olivier wrote:> Hi, > > I'm having some questions related to echo cancellation configuration > on a Digium board enabled systems (B410P, TE420, TE420B, ....) for > cases when a hardware ech canceller is present or not. > > I read in TEXXX manual that when setting echocancel=yes in > chan_dahdi.conf on a VPMOCT64-equiped system, 128ms hardware echo > cancellation was enabled. > > 1. I'm correct thinking that it is then impossible to switch from > hardware to software echo can without removing the VPMOCT64 module > itself ? > 2. Does the same also apply to HA8 and its VPMOCT032 module ?With DAHDI 2.6 (and possibly 2.5), it is possible to override the configuration and apply a software echo canceller to a channel even if it has a hardware one. With prior versions, yes, the echo cancellation module would have to be physically removed (or disabled using a parameter to the kernel module). -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at www.digium.com & www.asterisk.org