Try turning down the TDM TX gain or whatever setting is for the IP => TEL interface. Turn it down as far as you can stand. This will keep your phone from injecting echo into the conference. Also optimize your jitter buffers to as short as possible. Most likely you won't be able to find a conference server that also does echo cancellation. Most systems the DO have echo cancellation turn it OFF when they are conferencing because then it would just be cancelling EVERYTHING be cause it would detect the copies of the wave forms in every channel and think that it is echo. On 2/21/07, Pekka K. Kurki <pekka.kurki@intellectics.com> wrote:

sip calls and especially conferences on freeswitch seem to have a nasty echo compared to same devices on asterisk. anything to adjust the cancellation? the sipura adapters we are using have the cancellation enabled...

br, pekka

-- (Mr.) Pekka K. Kurki Intellectics GesmbH http://www.intellectics.com Helenenstrasse 44, A-2500 Baden, Austria Tel. +43 2256 815811 Mobile +43 699 12532539 Fax +43 2256 815819 (Tel. US: 360-2267729 UK: 0870 4787064) sip:pekka.kurki@sip.intellectics.com skype: pkkurki, pkkurki-sip (sip gateway) gtalk: pekkis50@gtalk.com (sip gateway - experimental) gizmo: pekkis50 h323:432256815811@sip.intellectics.com email: Pekka.Kurki@intellectics.com www: http://pekka.kurki.at

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