http://forums.asterisk.org/viewtopic.php?f=1&t=88967 http://stackoverflow.com/questions/20966934/any-help-every-time-ast-frame-dtmf-end- asterisk-11-5-1-app-confbridge-c In Asterisk11.5.1/funcs/func_frame_trace.c it works fine, but in my code issue : frame->frametype . BEGIN and END are not comming