Softphone

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] Often, a softphone is designed to behave like a traditional telephone, sometimes appearing as an image of a handset, with a display panel and buttons with which the user can interact. A softphone is usually used with a headset connected to the sound card of the PC or with a USB phone.[2]

Applications

See Comparison of VoIP software

Communication protocols

To communicate, both end-points must support the same voice-over-IP protocol, and at least one common audio codec.

Many service providers use the Session Initiation Protocol (SIP) standardized by the Internet Engineering Task Force (IETF). Skype, a popular service, uses proprietary protocols, and Google Talk leverages the Extensible Messaging and Presence Protocol (XMPP).

Some softphones also support the Inter-Asterisk eXchange protocol (IAX), a protocol supported by the open-source software application Asterisk.

Features

A typical softphone has all standard telephony features (DND, Mute, DTMF, Flash, Hold, Transfer etc.) and often additional features typical for online messaging, such as user presence indication, video, wide-band audio. Softphones provide a variety of audio codecs, a typical minimum set is G.711 and G.729.

Requirements

To make voice calls via the Internet, a user typically requires the following:

gollark: So do you have some code already written and need help debugging/improving it, or is this a "write all my code for me given a vague description" sort of thing?
gollark: What *exactly* is causing you problems? Also, this probably isn't urgent.
gollark: You should come up with a more specific question.
gollark: ÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆÆ
gollark: I don't know much about old CC versions but they're generally backward-compatible for programs.

See also

References
  1. "Citation from article entitled - Softphone initiation". S594098268.online-home.ca. Retrieved 14 October 2017.
  2. "SoftPhone - Community Help Wiki". Help.ubuntu.com. Retrieved 14 October 2017.
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