On 28/05/15 10:18, jg wrote: > >> Thank you all for valuable input, >> >> another question: when do I actually need the echo cancellation >> (hardware / on board /on module ) ? >> > It depends on your environment. If there are still analog devices in > addition to VoIP, I'd say always, but Asterisk has a rudimentary echo > canceller already on board. The Telcos use echo cancellers > themselves, but it cannot hurt to have a hardware canceller on your > BRI card.
I am going to have to be more specific, I see... We have the ISDN lines incoming into little boxes on the wall (BT ISDN 2e) from where they are plugged into existing ISDN PBX. The ISDN2e boxes have 2 ports, but 1 of each are connected to the ISDN PBX. There is nothing else connected to the ISDN2e boxes, no phones connect to these lines 'directly'. > > Nowadays I see more problems with reverberation in connection with > cheap speakerphones or simple mics and speakers on PCs, but that's a > different story. > > jh > Lukasz -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
