Free telephony software for linux

Math::Telephony::ErlangB is a Perl extension for Erlang B calculations.
SYNOPSIS
use Math::Telephony::ErlangB qw( :all );
# Evaluate blocking probability
$bprob = blocking_probability($traffic, $servers);
$gos = gos($traffic, $servers); # Same result as above
# Dimension minimum number of needed servers
$servers = servers($traffic, $gos);
# Calculate maximum serveable traffic
$traffic = traffic($servers, $gos); # Default precision 0.001
$traffic = traffic($servers, $gos, 1e-10);
This module contains various functions to deal with Erlang B calculations.
The Erlang B model allows dimensioning the number of servers in a M/M/S/0/inf model (Kendall notation):
- The input process is Markovian (Poisson in this case)
- The serving process is Markovian (ditto)
- There are S servers
- Theres no wait line (pure loss)
- The input population is infinite

Telephony::CountryDialingCodes is a Perl module that can convert international dialing codes to country codes and vice versa.

SYNOPSIS

# Usage method 1 (using object methods):
use Telephony::CountryDialingCodes;
my $o = new Telephony::CountryDialingCodes();
my $country_code = NL;
print "The dialing access code for country $country_code is " . $o->dialing_code($country_code) . "n";
my $dialing_code = 1;
my @country_codes = $o->country_codes($dialing_code);
print "The country code(s) for dialing access code $dialing_code is/are: " . join(,,@country_codes) . "n";


# Usage method 2 (using class methods):
use Telephony::CountryDialingCodes;
my $country_code = NL;
print "The dialing access code for country $country_code is " . Telephony::CountryDialingCodes->dialing_code($country_code) . "n";
my $dialing_code = 1;
my @country_codes = Telephony::CountryDialingCodes->country_codes($dialing_code);
print "The country code(s) for dialing access code $dialing_code is/are: " . join(,,@country_codes) . "n";

# Extracting an intl dialing code from an intl phone number:
use Telephony::CountryDialingCodes;
my $o = new Telephony::CountryDialingCodes();
my $dialing_code = $o->extract_dialing_code(+521234567890);
# $dialing_code will contain 52.

This class exports a method for determining a countrys international dialing code, and another method for doing the reverse: i.e. determining the country code(s) that belong(s) to a given international dialing code.

You can call these methods as class methods or you can create an object and call these methods as object methods. The difference is that if you call them in object context that the internal lookup tables are freed when the object is destroyed, otherwise if you call the methods in class context, then the internal lookup tables are global and will persist for the lifespan of the current process. Its not really a big deal which approach you choose, so for the sake of style, use the object method approach if you have no clue which is better.

SFLphone is a Voice over IP telephony software.
Voice over IP tends to be part of more and more corporate (and home) networks today.
As Open Source Software become more and more popular in companies, we decided to provide the community with a new powerful and open platform for desktop-based Voice over IP. SFLphone aims to become your desktops VoIP companion.
Main features:
- SIP and STUN support ;
- OSS and ALSA (since 0.3) audio devices support ;
- Skinned GUI ;
- G711u, G711a PCM, and GSM (since 0.3) codecs ;
- And nice other features !

The Wengophone is an easy to use program, that enables you to call anyone, anywhere, anytime, for free. Its native use of the SIP protocol makes it interoperable with most on the known VoIP technologies.
WengoPhone already has built-in video capabilities, and is will offer many more features in the near future such as calling ordinary phones (land lines and mobiles) at very low prices, conference calls, user communities and innovative cellphone-based services.
With our software, you have better audio quality, broader connectivity and low bandwidth usage. Additionally, thanks to its GPL licence and SIP-compliant foundations, you get the freedom of open source software: add functionnality or modify Wengophone to fit your needs.
We are aware of the challenge that is launching an open source project, not just in terms of creating a new technology, but also in getting developers and future customers to support the efforts. We are commited to consistent and honest communication.
OpenWengo and Wengos commercial ventures are complementary, and our goal is to provide an alternative to expensive and/or proprietary services.
We expect to compete strongly with Skype in the realm of software-based services (PC to PC) and complementary access modes (ATA, mobile devices). The trick? Free calls, Free software.
SIP, short for Session Initiation Protocol, is an open standard developed by the Internet Engineering Task Force. Eventually, it will enable interoperability with other compliant VoIP service providers. One will be able to call any other SIP-compliant softphone user, seamlessly and for free. Moreover, SIP will enable new services for mobile users.
Main features:
- MakingCalls
- ChatSupport
- VideoSupport
- Presence
- EmotiSounds
- FileTransfers
Wengo uses your broadband internet connection (DSL, Cable or WiFi) to provide telephony services. Call your friends, family, and colleagues anywhere, anytime, for free. Use video and chat features, also for free.
Wengo also offers low cost international rates (prepaid or unlimited) to land lines or mobile phones, and an SMS gateway service.
Wengo provides its customers with a Wenbox ATA, that enables the use of any regular phone. This device converts analog phone signals so that calls can be placed over the internet.

YateAdmin is a FREE powerful web interface which helps to set up the telephony engine Yate.
You can use it to setup:
- Users lines
- Register to other servers
- Routes for gateways
- Fallback routing
- Call Detail Report
- Yate status

Asterisk Desktop Manager application interfaces your VOIP telephony with the desktop and Asterisk PBX.
Asterisk Desktop Manager aims to integrate your desktop with the Asterisk PBX and hardware IP phone by providing some useful features such as automatic on-call volume reduction, one click dialling (from the clipboard), BlueTooth presence detection and automatic call redirection when you walk out of the office, a pop up browser on call, and transfer of the current call from the desktop.
Enhancements:
- Automatic on-call volume reduction
- One click dial from clipboard (paste number onto tray icon)
- Integrated phonebook
- List/Redirect/Hangup all active calls
- One click call forward setup
- Bluetooth presence detection to redirect calls when you walk out of the office
- Pop up browser on incoming call (integrate with your CRM to auto load customers details when they call)
- Cisco phone integration (auto speakerphone)
- Slide-in popup on incoming call, with Answer(cisco only), Hold, Busy and Redirect buttons , CallerID and duration

c2cWebdialer provides an extension which works with a CISCO IP telephony solution to provide an easy way to dial phone numbers.

C2cWebdialer extension works with a CISCO IP telephony solution to provide an easy way to dial phone numbers on web pages. Just select the phone number and choose "Dial with CISCO Webdialer" from the contextual menu !

C2CWebdialer has to be configured through the "Click2Call parameters" menu, it needs two parameters :

* The IP address or the DNS name of the CISCO CallManager on which the webdialer service is launched

* The dial out prefix that C2cWebdialer will put before the selected phone number

The webdialer feature must be activated on the CISCO CallManager.