1. Introduction

In Section 6.5.1 of [RFC3550], there are a number of recommendations for choosing a unique RTCP CNAME for an RTP endpoint. However, in practice, some of these methods are not guaranteed to produce a unique RTCP CNAME. [RFC6222] updated the guidelines for choosing RTCP CNAMEs, superseding those presented in Section 6.5.1 of [RFC3550]. Unfortunately, some parts of the new algorithms are rather complicated and also produce RTCP CNAMEs that, in some cases, are potentially linkable over multiple RTCP sessions even if a new RTCP CNAME is generated for each session. This document specifies a replacement for the algorithm in Section 5 of [RFC6222], which does not have this limitation and is also simpler to implement.

For a discussion on the linkability of RTCP CNAMEs produced by [RFC6222], refer to [RESCORLA].