Hi!<br><br>I have probed t38modem several times without success.<br>The most I get was sending with t38modem and terminate faxes on a third-part reseller, but with low bandwith sync between t38modem and my asterisk. it syncs at 2400 bpps.<br>
So If we (you and me) could get a working configuration for this, It will be great.<br>I've wrote this list several times asking for this issue without any answer.<br><br>If you wonna collaborate, please tell me.<br><br>
Regards,<br>Miguel Amez<br><br><div class="gmail_quote">2010/6/24 Ben Winslow <span dir="ltr"><<a href="mailto:winslowb@pa.net">winslowb@pa.net</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hello folks,<br>
<br>
I've been trying to get T.38 over SIP working with calls terminated by a<br>
MAX/Lucent/Ascent TNT. As far as I can tell, SIP and T.38 are actually<br>
working perfectly; however, I can't get the TNT to properly terminate a<br>
FAX call. Does anyone have a working configuration for SIP and T.38 for<br>
calls from a TNT or APX?<br>
<br>
Here's a brief description/diagram of my test setup:<br>
<br>
Laptop --RS232--> Modem --POTS--> Channel bank (ADIT 600) --CAS T1--><br>
TNT --Ethernet/SIP--> Asterisk --SIP--> t38modem.<br>
<br>
The TNT is running TAOS 11.0.4 with both the SIP and realtime fax<br>
features licensed. I've tried using several modems, and with each I can<br>
establish a data call without any problems (although at a maximum of<br>
31200bps/3429 baud using a 33.6 modem, for reasons I haven't dug into<br>
yet.) Whenever I try to send a fax from the laptop, however, the call<br>
always seems to fail in the first HDLC phase (phase B) with either a<br>
timeout or error 23 (COMREC invalid command received.) The modem is<br>
connected directly to the channel bank and the channel bank is connected<br>
directly to the TNT in an attempt to reduce the number of variables.<br>
<br>
With my current configuration, the call to Asterisk will come up as a<br>
voice call, then be dumped into t38modem when Asterisk receives the<br>
1100Hz CNG tone from the sending modem. At that point, the call is<br>
dumped into t38modem which re-invites the TNT with the T.38 options, and<br>
the TNT usually sends a T.38 t30-ind of 0x00 (no-signal) or 0x3a (???),<br>
although I do occasionally see more promising messages like<br>
v29-7200-training or t30-data/hdlc-fcs-ok. Shortly thereafter, the<br>
dialing modem will give up and terminate the call.<br>
<br>
If I try dumping the same call into iaxmodem instead of t38modem, the<br>
call actually progresses further -- the real modem receives and decodes<br>
the HDLC CSI/DIS from iaxmodem, but the high-speed trainup always fails<br>
for calls coming from the TNT.<br>
<br>
Does anyone have any advice or suggestions? Has anyone actually made<br>
T.38 work with one of these devices running ANY TAOS version?<br>
<br>
Thanks,<br>
--<br>
Ben Winslow <<a href="mailto:winslowb@pa.net">winslowb@pa.net</a>><br>
<br>
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</blockquote></div><br>