11-19-2002
R. Prabhu,
if this is home work , You have missed FAQ and rules of this site. check them out first.
Simply speaking , pstn networks can use unix "gateways" to transmit voice over I.P.
that is if u have backbone for pstn ready , than this is what happens:
caller A picks up a phone , gets dial tone (from PSTN backbone)
dial a no of reciver B. The gateway server uses TCP /IP , which sends this signal as packet based ,to another Gateway node in IP world , which than looks at this package , decides which destination gateway can handle this package (or telephone no),
forwards it there , than that gateway sends that package to reciver B. and call is completed. As I.P is Packed based ,there is no dedicated connection , that is every one can use same connection . where as in PSTN pure network , one a link is established , it can not be used untill free.
regarding coding , i dont know. But You got to write a code , how to connect to or "dial in" ( i think using cu "tel no" command)to a getway server.
good luck
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LEARN ABOUT HPUX
faxanswer
FAXANSWER(8) System Manager's Manual FAXANSWER(8)
NAME
faxanswer - tell a HylaFAX server to answer the telephone
SYNOPSIS
/usr/sbin/faxanswer [ -q queue-dir ] [ -h how ] modem
DESCRIPTION
faxanswer sends a message to the HylaFAX faxgetty(8) process servicing modem telling it to answer the telephone. This is useful, for exam-
ple, when a modem is used on a shared phone line and the server is configured to not normally answer the phone.
The specified modem can either be the name (typically the last component of the terminal port the modem is attached to), or the full name
of the associated FIFO named pipe file, e.g. ``FIFO.ttym2''.
OPTIONS
-q dir Use a spooling area other than /var/spool/hylafax.
-h Specify exactly how the phone should be answered. By default, the server process is instructed to answer the phone and accept
any kind of call (voice, data, fax). Discrimination of the type of call is dependent on a modem's adaptive-answer support. The
-h option can be used to force the server to answer the phone for particular type of call: one of fax, data, voice, any, extern
(to force faxgetty to invoke an external application to to handle the call), or dialX (where X is a dialstring to dial before
initiating a fax reception). If using dialX, the specified dialstring will likely need to end with a semicolon (``;'').
FILES
/var/spool/hylafax default spooling area
/var/spool/hylafax/FIFO fifo for contacting faxq
Consult hylafax-server(5) for a complete discussion of the structure and content of the spooling area.
SEE ALSO
hylafax-server(5), faxgetty(8)
May 23, 1996 FAXANSWER(8)