Session Description Protocol
SDP is the format specified for data carried within a SAP
packet. It informas a multicast client of such information as the desciptive name
of the data (eg: 'Madonna Concert Live Webcast') as well as the type of data and the rate at which it is being transmitted ('RAW MPEG1
2.5Mps Stream'). The data is stored using plain ASCII
, making the packet east to parse. It includes the option to add additional custom information, which is automatically discarded by any client that does not support it.