In order to participate in the Audio-via-IP Experts Group it is necessary to support the mandatory algorithms and implementations listed in the N/ACIP document on Audio-over-IP and to successfully participate in interoperability tests with the already existing partners. The feature list which needs to be supported to join the logo program is given as follows: IP Protocols: SIP, SDP, RTP, RTCP* Audio Formats: MPEG Layer 2, 3, G.711, G.722* Analysis: RTP statistics* *Details can be obtained by request