http://www.rfc-editor.org/rfc/rfc5391.txt
RFC 5391: RTP Payload Format for ITU-T Recommendation G.711.1, A. Sollaud2008-11-01T23:00:00-00:00This document specifies a Real-time Transport Protocol (RTP) payload format to be used for the ITU Telecommunication Standardization Sector (ITU-T) G.711.1 audio codec. Two media type registrations are also included. [STANDARDS-TRACK]