[1] RFC 4975 - The Message Session Relay Protocol (MSRP) ( ( 版)) <http://tools.ietf.org/html/rfc4975>
[2] RFC 4976 - Relay Extensions for the Message Sessions Relay Protocol (MSRP) ( ( 版)) <https://tools.ietf.org/html/rfc4976>
[3] RFC 7977 - The WebSocket Protocol as a Transport for the Message Session Relay Protocol (MSRP) () <https://tools.ietf.org/html/rfc7977>