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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regexp::common::uri::tel

Regexp::Common::URI::tel(3)				User Contributed Perl Documentation			       Regexp::Common::URI::tel(3)

NAME

       Regexp::Common::URI::tel -- Returns a pattern for telephone URIs.

SYNOPSIS

	   use Regexp::Common qw /URI/;

	   while (<>) {
	       /$RE{URI}{tel}/	     and  print "Contains a telephone URI.
";
	   }

DESCRIPTION

   $RE{URI}{tel}
       Returns a pattern that matches tel URIs, as defined by RFC 2806.  Under "{-keep}", the following are returned:

       $1  The complete URI.

       $2  The scheme.

       $3  The phone number, including any possible add-ons like ISDN subaddress, a post dial part, area specifier, service provider, etc.

   $RE{URI}{tel}{nofuture}
       As above (including what's returned by "{-keep}"), with the exception that future extensions are not allowed. Without allowing those future
       extensions, it becomes much easier to check a URI if the correct syntax for post dial, service provider, phone context, etc has been used -
       otherwise the regex could always classify them as a future extension.

REFERENCES

       [RFC 1035]
	   Mockapetris, P.: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION.  November 1987.

       [RFC 2396]
	   Berners-Lee, Tim, Fielding, R., and Masinter, L.: Uniform Resource Identifiers (URI): Generic Syntax. August 1998.

       [RFC 2806]
	   Vaha-Sipila, A.: URLs for Telephone Calls. April 2000.

SEE ALSO

       Regexp::Common::URI for other supported URIs.

AUTHOR

       Damian Conway (damian@conway.org)

MAINTAINANCE

       This package is maintained by Abigail (regexp-common@abigail.be).

BUGS AND IRRITATIONS

       Bound to be plenty.

LICENSE and COPYRIGHT
       This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.

       This module is free software, and maybe used under any of the following licenses:

	1) The Perl Artistic License.	  See the file COPYRIGHT.AL.
	2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
	3) The BSD Licence.		  See the file COPYRIGHT.BSD.
	4) The MIT Licence.		  See the file COPYRIGHT.MIT.

perl v5.18.2							    2013-03-08					       Regexp::Common::URI::tel(3)