Licensing
Usage of Siren 7 and Siren 14 compressions require the licencing of patents from Polycom, in most countries. A royalty free licence for Siren 7 and Siren 14 is available from Polycom if certain fairly basic conditions are met.
Usage of Siren 22 also require the licencing of patents from Polycom.
Read more about this topic: Siren (codec)