[Freeswitch-users] DTMF when speaking

Hello! Sometimes (very rarely) when I speaking I can hear DTMF signals. So the question is - may the FS (proxy_media=false, bypass_media=false) generate this DTMFs if no start_dtfm application is used? FS version is git-3c74f39 2011-07-22 23-06-06 +0200. Clients devices are different: Planet, Linksys, Audiocodes and even Cisco 5350. -- Regards, Boris