Figure 5: Sample SDP data. Connection information (such as an IP address) is described by the c= parameter. Audio attributes (such as the port to receive the data and compression attributes) are conveyed with the m= parameter. Finally, the attribute header (a=) lets you describe compression attributes conveyed in the m= in greater detail. In this example, the payload (96) is introduced by the m= parameter, then described in greater detail by a=rtpmap:.