The condition is , Fax Modem is available over a TCP socket.

Let say .. 192.168.1.59 port 4001

Now, in order to use that as a local serial modem.
I use a remserial which redirect the TCP socket a local serial port.

Get the source from here :

http://lpccomp.bc.ca/remserial/

once done the following

copy its binary into /usr/local/sbin/remserial

then test.

/usr/local/sbin/remserial -r 192.168.1.59 -p 4001 -l /dev/modem /dev/ptmx

.. now time to test.

try with minicom -s

serial port : /dev/modem
speed : 9600
bit : 8N1

AT
OK
ATZ
OK
ATI4
will return the modem detail.

to call

ATDT0123456779;

now to test the fax..

 
yum install efax

make a .ps file using OpenOffice -> print to file -> ps.

fax PAGE=a4 DEV=modem FROM="namran.net" NAME="Namran"  send -v 0370002778 /home/namran/Desktop/fax2.ps

replace the 0370002778 with the destination number.

or if want directly to use efax with CLASS=1 .. need to convert to 001 first

efax -o 1   -d /dev/modem -t T30001629 /home/namran/Desktop/fax.ps.001

Example result :

[root@home ~]# fax PAGE=a4 DEV=modem FROM="namran.net" NAME="Namran" CLASS="1" send -v 70002778 /tmp/ashraf.ps 
/tmp/ashraf.ps is postscript...
/usr/bin/efax: Thu Jun 23 14:49:10 2011 efax v 0.9 Copyright 1999 Ed Casas
efax: 49:10 Warning: local ID (namran.net) has non-standard characters
efax: 49:10 TIFF version 4.2 file (little-endian)
efax: 49:10 TIFF directory at 8 with 20 tags, last image.
efax: 49:10 page 1 : /tmp/ashraf.ps.001 + 338 : 1728x2156 @ 204x196 dpi TIFF/FAX
efax: 49:10 argv[0]=/usr/bin/efax
efax: 49:10 argv[1]=-v
efax: 49:10 argv[2]=chewmainrxtf
efax: 49:10 argv[3]=-v
efax: 49:10 argv[4]=chewmainrxtf
efax: 49:10 argv[5]=-d/dev/modem
efax: 49:10 argv[6]=-x
efax: 49:10 argv[7]=/var/lock/LCK..modem
efax: 49:10 argv[8]=-iZ
efax: 49:10 argv[9]=-i&FE&D2S7=120
efax: 49:10 argv[10]=-i&C0
efax: 49:10 argv[11]=-iM1L0
efax: 49:10 argv[12]=-l
efax: 49:10 argv[13]=namran.net
efax: 49:10 argv[14]=-kZ
efax: 49:10 argv[15]=-h
efax: 49:10 argv[16]=2011/06/23 14:49     namran.net      Namran     p. %d/%d
efax: 49:10 argv[17]=-t
efax: 49:10 argv[18]=T70002778
efax: 49:10 argv[19]=/tmp/ashraf.ps.001
efax: 49:10 created text lock file /var/lock/LCK..modem
efax: 49:10 opened /dev/modem
efax: 49:10 command  "Q0V1"
efax: 49:10 waiting 2.0 s
efax: 49:10 .540 [ATQ0V1]
efax: 49:10 .577 [OK]
efax: 49:10 response "OK"
efax: 49:10 command  "Z"
efax: 49:10 waiting 5.0 s
efax: 49:10 .682 [ATZ]
efax: 49:10 .895 [OK]
efax: 49:10 response "OK"
efax: 49:10 command  "&FE&D2S7=120"
efax: 49:10 waiting 5.0 s
efax: 49:11 .000 [AT&FE&D2S7=120]
efax: 49:11 .051 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "&C0"
efax: 49:11 waiting 5.0 s
efax: 49:11 .194 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "M1L0"
efax: 49:11 waiting 5.0 s
efax: 49:11 .338 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "E0"
efax: 49:11 waiting 5.0 s
efax: 49:11 .481 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "I3"
efax: 49:11 waiting 5.0 s
efax: 49:11 .624 [CX81802-V90]
efax: 49:11 .628 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "+FCLASS=?"
efax: 49:11 waiting 5.0 s
efax: 49:11 .779 [0,1,1.0,8,10]
efax: 49:11 .788 [OK]
efax: 49:11 response "OK"
efax: 49:11 command  "+FCLASS=1"
efax: 49:11 waiting 5.0 s
efax: 49:11 .935 [OK]
efax: 49:11 response "OK"
efax: 49:11 using CX81802-V90 in class 1
efax: 49:12 command  "+FTM=?"
efax: 49:12 waiting 5.0 s
efax: 49:12 .080 [3,24,48,72,73,74,96,97,98,121,122,145,146]
efax: 49:12 .101 [OK]
efax: 49:12 response "OK"
efax: 49:12 dialing T79582778
efax: 49:12 command  "DT79582778"
efax: 49:12 waiting 120.0 s
efax: 49:22 .213 [CONNECT]
efax: 49:22 response "CONNECT"
efax: 49:22 connected
efax: 49:23 waiting 2.0 s
efax: 49:23 .644 [OK]
efax: 49:23 response "OK"
efax: 49:23 Warning: bit-reversed HDLC frame, reversing bit order
efax: 49:23 received 22 bytes:
efax: 49:23  ff c0 04 00 00 70 00 00 00 68 f0 80 c0 00 08 a0
efax: 49:23  40 a9 13 10 e1 d8
efax: 49:23 received NSF - answering features
efax: 49:23 command  "+FRH=3"
efax: 49:23 waiting 35.0 s
efax: 49:23 .689 [CONNECT]
efax: 49:23 response "CONNECT"
efax: 49:24 waiting 2.0 s
efax: 49:24 .033 [OK]
efax: 49:24 response "OK"
efax: 49:24 received 11 bytes:
efax: 49:24  ff c8 01 00 73 1d 01 01 88 03 ae
efax: 49:24 received DIS - answering capabilities
efax: 49:24 remote has no document(s) to send, and can receive
efax: 49:24 local   196lpi 14.4kbps 8.5"/215mm  any   1D    -     -  0ms
efax: 49:24 remote  196lpi  9600bps 8.5"/215mm  any   2D    -     -  20/10ms
efax: 49:24 session 196lpi  9600bps 8.5"/215mm  any   1D    -     -  10ms
efax: 49:24 command  "+FTH=3"
efax: 49:24 waiting 3.1 s
efax: 49:24 .108 [CONNECT]
efax: 49:24 response "CONNECT"
efax: 49:24 sent 23 bytes:
efax: 49:24  ff c0 c2 2e a6 76 74 76 86 4e b6 86 76 04 04 04
efax: 49:24  04 04 04 04 04 04 04
efax: 49:24 sent TSI - caller ID
efax: 49:24 waiting 13.6 s
efax: 49:25 .893 [CONNECT]
efax: 49:25 response "CONNECT"
efax: 49:25 sent 6 bytes: ff c8 c1 00 62 14
efax: 49:25 sent DCS - session format
efax: 49:25 waiting 13.6 s
efax: 49:26 .315 [OK]
efax: 49:26 response "OK"
efax: 49:26 command  "+FTS=8"
efax: 49:26 waiting 3.0 s
efax: 49:26 .444 [OK]
efax: 49:26 response "OK"
efax: 49:26 command  "+FTM=96"
efax: 49:26 waiting 3.1 s
efax: 49:26 .516 [CONNECT]
efax: 49:26 response "CONNECT"
efax: 49:27 waiting 30.0 s
efax: 49:28 .477 [OK]
efax: 49:28 response "OK"
efax: 49:28 sent TCF - channel check of 1800 bytes
efax: 49:28 command  "+FRS=1"
efax: 49:28 waiting 3.0 s
efax: 49:28 .567 [OK]
efax: 49:28 response "OK"
efax: 49:28 command  "+FRH=3"
efax: 49:28 waiting 3.0 s
efax: 49:29 .726 [CONNECT]
efax: 49:29 response "CONNECT"
efax: 49:30 waiting 2.0 s
efax: 49:30 .727 [OK]
efax: 49:30 response "OK"
efax: 49:30 received 5 bytes: ff c8 21 57 be
efax: 49:30 received CFR - channel OK
efax: 49:30 command  "+FTM=96"
efax: 49:30 waiting 3.1 s
efax: 49:30 .800 [CONNECT]
efax: 49:30 response "CONNECT"
efax: 49:30 padding to 12 bytes/scan line.
efax: 49:30 header:[2011/06/23 14:49     namran.net      Namran     p. 1/1]
efax: 49:51 waiting 30.0 s
efax: 49:55 .331 [OK]
efax: 49:55 response "OK"
efax: 49:55 sent 20+2156 lines, 10384+18500 bytes, 25 s  9242 bps
efax: 49:55 command  "+FTS=8"
efax: 49:55 waiting 3.0 s
efax: 49:55 .472 [OK]
efax: 49:55 response "OK"
efax: 49:55 command  "+FTH=3"
efax: 49:55 waiting 3.1 s
efax: 49:55 .539 [CONNECT]
efax: 49:55 response "CONNECT"
efax: 49:55 sent 3 bytes: ff c8 f4
efax: 49:55 sent EOP - done
efax: 49:55 waiting 13.6 s
efax: 49:56 .843 [OK]
efax: 49:56 response "OK"
efax: 49:56 command  "+FRH=3"
efax: 49:56 waiting 3.0 s
efax: 49:57 .631 [CONNECT]
efax: 49:57 response "CONNECT"
efax: 49:58 waiting 2.0 s
efax: 49:58 .600 [OK]
efax: 49:58 response "OK"
efax: 49:58 received 5 bytes: ff c8 31 45 8f
efax: 49:58 received MCF - page OK
efax: 49:58 sent -> /tmp/ashraf.ps.001
efax: 49:58 command  "+FTH=3"
efax: 49:58 waiting 3.1 s
efax: 49:58 .661 [CONNECT]
efax: 49:58 response "CONNECT"
efax: 49:58 sent 3 bytes: ff c8 5f
efax: 49:58 sent DCN - disconnect
efax: 49:58 waiting 13.6 s
efax: 49:59 .963 [OK]
efax: 49:59 response "OK"
efax: 49:59 command  "H"
efax: 49:59 waiting 5.0 s
efax: 50:00 .836 [OK]
efax: 50:00 response "OK"
efax: 50:00 command  "Q0V1"
efax: 50:00 waiting 2.0 s
efax: 50:00 .980 [OK]
efax: 50:00 response "OK"
efax: 50:01 command  "Z"
efax: 50:01 waiting 5.0 s
efax: 50:01 .298 [OK]
efax: 50:01 response "OK"
efax: 50:01 read HDB pid 6643 [      6643] from /var/lock/LCK..modem (our pid)
efax: 50:01 removed lock file /var/lock/LCK..modem
efax: 50:01 done, returning 0 (success)
[root@home ~]# 

:)

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