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2010 Jun 24
2
T.38 on a MAX/Lucent/Ascend TNT
...(ADIT 600) --CAS T1--> 
TNT --Ethernet/SIP--> Asterisk --SIP--> t38modem.
The TNT is running TAOS 11.0.4 with both the SIP and realtime fax 
features licensed.  I've tried using several modems, and with each I can 
establish a data call without any problems (although at a maximum of 
31200bps/3429 baud using a 33.6 modem, for reasons I haven't dug into 
yet.)  Whenever I try to send a fax from the laptop, however, the call 
always seems to fail in the first HDLC phase (phase B) with either a 
timeout or error 23 (COMREC invalid command received.)  The modem is 
connected directly to...