InformaCast is a proprietary

Voice over IP Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms Interne ...

network protocol for live audio paging. The protocol allows endpoints (such as

public address A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound sou ...

speakers) to autonomously announce their presence and capabilities (such as recording or GPIO) and configure themselves to play audio broadcasts. InformaCast was originally developed by Berbee and later spun off into a separate company as Singlewire Software. The protocol is built largely on standard technologies including SLP for locating a configuration server, TFTP for obtaining configuration data,

HTTP The Hypertext Transfer Protocol (HTTP) is an application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web, ...

and

XML Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. ...

for registering devices and transmitting commands, and

multicast In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused wit ...

RTP for audio playback and recording.

Further reading