Our setup is: 9.6k Modem <-analog-> Mitel SX-200 <-(pri)-> Asterisk <-(pri) -> Telco The modem works fine with the Mitel directly connected to the Telco, but once we add Asterisk in between connections start failing. I suspect the issue is caused by the echo canceller, since I believe the issue appear about the time we turned echo cancellation on (for the IAX users). We don't need echo cancellation for PRI to PRI calls. I've looked around, but I am finding conflicting opinions on what the "echocancelwhenbridged" line does. Some say it turns off the echo canceller for TDM to TDM calls if set to yes, some say if it is set to no. Which is correct? ;Zaptel Channels Configurations (zapata.conf) [trunkgroups] [channels] context=default usecallerid=yes facilityenable=yes hidecallerid=no callwaiting=yes usecallingpres=yes callwaitingcallerid=yes threewaycalling=yes transfer=yes canpark=yes cancallforward=yes callreturn=yes echocancel=yes echocancelwhenbridged=yes resetinterval=never rxgain=0.0 txgain=0.0 group=1 callgroup=1 pickupgroup=1 immediate=no ;Sangoma A102 port 1 [slot:10 bus:1 span: 1] switchtype=national context=from-internal group=1 signalling=pri_net channel => 1-23 ;Sangoma A102 port 2 [slot:10 bus:1 span: 2] switchtype=national context=from-pstn group=0 signalling=pri_cpe channel => 25-47
On 3/20/07, Mark Farver <mfarver@ticom.com> wrote:> I suspect the issue is caused by the echo canceller, since I believe the > issue appear about the time we turned echo cancellation on (for the IAX > users). We don't need echo cancellation for PRI to PRI calls. I've > looked around, but I am finding conflicting opinions on what the > "echocancelwhenbridged" line does. Some say it turns off the echo > canceller for TDM to TDM calls if set to yes, some say if it is set to > no. Which is correct?Mark, The name of the option is fairly clear. If you want echo cancellation even when the call is bridged directly from card to card, set the option to 'yes'. Otherwise, set the option to 'no'. This option should be 'no' in the majority of cases. William