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 NETBSD

isdntelctl

ISDNTELCTL(8)						    BSD System Manager's Manual 					     ISDNTELCTL(8)

NAME

     isdntelctl -- control isdn4bsd telephone sound format conversion

SYNOPSIS

     isdntelctl [-c] [-g] [-u unit] [-A] [-U] [-N]

DESCRIPTION

     isdntelctl is part of the isdn4bsd package and is used to configure the sound format conversion facilities of the /dev/isdntel interfaces.

     The following options are available:

     -c      Clear the telephone input queue.

     -g      Get the sound format currently in use.

     -u      Set the /dev/isdntel unit number.	The default value is zero to access device /dev/isdntel0.

     -A      Do A-law (ISDN line) -> mu-law (userland) conversion.

     -U      Do mu-law (ISDN line) -> A-law (userland) conversion.

     -N      Set sound conversion to do no format conversion.

     The telephony data stream comes out of the line in a bit-reversed format, so the isdntel(4) driver does the bit-reversion process in any
     case.

     Additionally, the user can specify to do A-law to mu-law, mu-law to A-law or no conversion at all in the isdntel driver by using the
     isdntelctl utility.

FILES

     /dev/isdntel<n>

EXAMPLES

     The command

	   isdntelctl -g

     displays the currently used sound format for device /dev/isdntel0.

SEE ALSO

     isdntel(4), isdnd.rc(5), isdnd(8)

STANDARDS

     A-law and mu-law are specified in ITU Recommendation G.711.

AUTHORS

     The isdntelctl utility and this man page were written by Hellmuth Michaelis <hm@kts.org>.

BSD
								  April 21, 1999							       BSD