telephone working in unix Post: 32159

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Top Forums UNIX for Dummies Questions & Answers telephone working in unix Post 32159 by raju on Tuesday 19th of November 2002 06:37:49 PM

11-19-2002

raju

Guest

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

raju

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LEARN ABOUT OSF1

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)