I'm newbie of FS. I have setup the FS. Most is perfect. I connect FS to PSTN with DID numbers. For inband I connect it to FS�s demo_ivr. When I press the key, the FS accept always DOUBLE of key. The debug information like below. 2009-03-22 17:50:26 [DEBUG] switch_rtp.c:1767 switch_rtp_dequeue_dtmf() RTP RECV DTMF 1:2000 2009-03-22 17:50:26 [DEBUG] switch_ivr_play_say.c:1279 switch_ivr_play_file() done playing file 2009-03-22 17:50:26 [DEBUG] switch_ivr_menu.c:308 play_and_collect() waiting for 3/4 digits t/o 2000 2009-03-22 17:50:26 [DEBUG] sofia.c:3753 sofia_handle_sip_i_info() INFO DTMF(1) 2009-03-22 17:50:28 [DEBUG] switch_ivr_menu.c:353 play_and_collect() digits '11' 2009-03-22 17:50:28 [DEBUG] switch_ivr_menu.c:523 switch_ivr_menu_execute() IVR menu 'jtq_greating' caught invalid input '11' 2009-03-22 17:50:28 [DEBUG] switch_ivr_play_say.c:989 switch_ivr_play_file() Codec Activated L16@8000hz 1 channels 20ms 2009-03-22 17:50:28 [DEBUG] switch_core_io.c:652 switch_core_session_write_frame() sofia/external/13323015 Can any friend can help me? Zhao Xiaoqiang