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Exchanging keys to encrypt media streams in the Session Initiation Protocol (SIP) has proved challenging. The challenge has been to devise a key transmission protocol that preserves the features of SIP while minimizing key exposure to unintended parties and eliminating voice clipping. We first briefly survey the two IETF SIP media keying protocols -SDES and DTLS-SRTP -and evaluate them against a core feature set. We then introduce a novel simple and lightweight scheme to significantly increasedoi:10.1145/1941530.1941535 dblp:conf/iptcomm/GurbaniK10 fatcat:wndq6y5pavez5c42dwmgxll7ou