search for: 1100hz

...The modem is connected directly to the channel bank and the channel bank is connected directly to the TNT in an attempt to reduce the number of variables. With my current configuration, the call to Asterisk will come up as a voice call, then be dumped into t38modem when Asterisk receives the 1100Hz CNG tone from the sending modem. At that point, the call is dumped into t38modem which re-invites the TNT with the T.38 options, and the TNT usually sends a T.38 t30-ind of 0x00 (no-signal) or 0x3a (???), although I do occasionally see more promising messages like v29-7200-training or t30-data...

...= NO MTU = 1500 UDPPORT = 9000 TTL = 255 IGNORE_FRONT_END = NO TDMV_SPAN = 1 TDMV_DCHAN = 0 TDMV_HW_DTMF = NO # YES: receive dtmf events from hardware TDMV_HW_FAX_DETECT = NO # YES: receive fax 1100hz events from hardware [w1g1] ACTIVE_CH = ALL TDMV_HWEC = YES MTU = 8 /etc/dahdi/system.conf: defaultzone=be loadzone=be span=1,1,0,ccs,hdb3 dchan=16 bchan=1-15,17-31 echocanceller=mg2,1-15,17-31 span=2,2,0,ccs,hdb3 dchan=47 bchan=32-46,48-62 echocanceller=mg2,32-46,48-62...

...34224 and fax-tx-audio-b7933500-070905134224) appeared in /tmp. I used Cool96 (an old Win98 free program) to import this audio data (8KHz mono 16bit PCM-Intel), and it appears that there is currently no fax synchronisation nor negotiation at all. All I see in Cool96 is that the fax send its CNG (a 1100Hz tone during 0.5severy 3 seconds), and that Asterisk application app_rxfax() answer with an exactly identical tone. I am not very specialist of T.30 protocol, but I thought that in this case SPANDSP would have answered with a CED tone (a 2100Hz tone during 2.5s), like explained here (http://www.eico...