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The Session Description Protocol is a protocol that was designed for the purpose of describing media sessions. Typically SDP is not a standalone protocol, but rather is used by other signaling protocols such as SIP or MGCP to exchange media information during session setup. For a typical call setup using SIP, the SDP would be used to describe a number of parameters. Some of these parameters may include but are not limited to: an IP address and port at which the user would like the media to be sent, the type of media, and a list of supported codecs for a particular type of media. A model for using SDP to setup media sessions within a higher level protocol such as SIP is defined by RFC 3264. VOCAL's software fully supports the Session Description Protocol as defined by RFC 4566 as well as the SDP offer/answer model as defined by RFC 3264.