Siren (codec)

It was approved after a four-year selection process involving extensive testing.

[11][12] Siren 7 is commonly used in videoconferencing systems and is also part of Microsoft Office Communicator when using A/V conferencing.

Microsoft Office Communications Server uses Siren 7 during audio conferencing.

When a call is promoted into an audio conference (any time 3 or more participants have joined), the codec is switched on the fly to Siren.

[16][17][18] aMSN, an open source Windows Live Messenger clone uses for Siren audio compression and decompression the "libsiren" library, an open source implementation of the codec, written by aMSN developer Youness Alaoui (KaKaRoTo) .

[19] The libsiren library has also been copied into libmsn and into the msn-pecan project, which provides plug-in for Pidgin and Adium instant messaging clients.