[cisco-nas] using AS5300/MICA to send out faxes?

[Gert Doering]

Hi,

I'm currently evaluating use of our existing AS5300 to send out faxes
from one of our fax servers.

Nothing sophisticated like T.37, T.38, ... - just "open TCP/IP connection
to AS5300, talk AT commands to modem, send fax that way".

The AS5300 stubbornly refuses cooperation - that is, it will talk to
me, accept AT+FCLASS=2 or +FCLASS=2.0 commands, and dial out, but 
a few seconds after the remote modem picks up and you can hear fax/modem
noises, it will hang up, and signal "NO CARRIER".  (FAR too quickly,
it should at least try 30 seconds or so...)

This is how a typical attempt looks like:

$ telnet router 2021
...
ati
Modem product ID = 242

OK
ati3

Cisco MICA Hex Modem Module Product Information

Country Code            217
V.92(MOH,QC), V.90, K56FLEX 1.1, V.34+, V.22bis,
V.42, MNP2-4, V.44, V.42bis, MNP5, Fax, V.110, SS7_COT, TRACE

HEX modem index         05
CP code revision        2.9.5.0
CP revision date        Sep 09 2003

SP code revision        2.9.5.0
SP revision date        09/09/2003 (MM/DD/YYYY)


OK
ATS7=60
OK
AT+FCLASS=2.0
OK
ATD35663087
NO CARRIER

- I tried this with 3 known-working fax devices at the receiving end
(ZyXEL 1496/POTS, ZyXEL 2864/ISDN, plain-paper standalone fax machine),
but same effect every time.

Is there any specific trick to it, or is it a case of "this is not 
supported, it will not work"?


Hmmm.  It *seems* that I'm not accessing the modem properly - a few
seconds after my last attempt, with me still being in telnet (writing
this mail), suddenly I had this in my telnet window:

AT&F&D2S34=18000S40=10S54=456debugthismodemS71=4
OK

... so it seems that "the router wanting to talk to the modem" and
"my telnet connection to line 21" are interfering here.

So what's the recommended way to do

  - "TCP/IP connection to AS5300"
  - "talk AT commands to modem"
  - "send fax"?

thanks for your assistance,

gert


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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de