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Jitsi, a Java VoIP and Instant Messaging client with ZRTP encryption, for FreeBSD, Linux, OS X, Windows; LGPL; Linphone, with a core/UI separation, the GUI is using Qt libraries, for Linux, OS X, Windows, and mobile phones (Android, iPhone, Windows Phone, BlackBerry) MicroSIP, lightweight softphone, using PJSIP stack, for Windows
Softphone applications serve as the primary client-side implementation of VoIP technology. These applications transform standard computing devices into full-featured communication endpoints, supporting voice and video calls over IP networks while providing standard telephony functions.
MicroSIP is a lightweight, open-source software application that enables users to make Voice over IP (VoIP) calls using the SIP (Session Initiation Protocol) standard. It is designed to be simple, easy to use, and resource-efficient, making it an ideal choice for low-resource devices, such as older computers, and for users who need a minimalistic VoIP client.
When OldVersion.com was launched it offered 80 versions of 14 programs. [2] By 2005, over 500 versions were posted. [3] By 28 August 2007, this had grown to 2388 versions of 179 programs, in categories such as "graphics", "file-sharing", "security" and "enterprise". [4] [5] The site also carries 600+ versions of 35 Macintosh programs. [6]
A softphone is a software program for making telephone calls over the Internet using a general purpose computer rather than dedicated hardware. The softphone can be installed on a piece of equipment such as a desktop , mobile device , or other computer and allows the user to place and receive calls without requiring an actual telephone set. [ 1 ]
However, the EKA2 kernel version did not ship until Symbian OS 8.1b. The kernels behave more or less identically from user-side, but are internally very different. EKA1 was chosen by some manufacturers to maintain compatibility with old device drivers, while EKA2 was a real-time kernel. 8.0b was deproductised in 2003.
3CX, Inc., is a software development company and developer of the 3CX Phone System. The 3CX Phone System is a software private branch exchange based on the SIP (Session Initiation Protocol) standard to allow calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services.
The first version of Acrobits Softphone was released on the App Store in April 2009. Version 1.0 supported only a single SIP account and the G711 and GSM codecs. During the following months new updates were released rapidly, adding new features, and the app quickly became the most downloaded paid SIP app for iOS worldwide.