An Opportunistic Approach for Secure Real-time Transport Protocol (OSRTP)

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Document Type Expired Internet-Draft (sipbrandy WG)
Last updated 2017-05-03 (latest revision 2016-10-30)
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Opportunistic Secure Real-time Transport Protocol (OSRTP) allows encrypted media to be used in environments where support for encryption is not known in advance, and not required. OSRTP is an implementation of Opportunistic Security, as defined in RFC 7435. OSRTP does not require advanced SDP extensions or features and is fully backwards compatible with existing secure and insecure implementations. OSRTP is not specific to any key management technique for SRTP. OSRTP is a transitional approach useful for migrating existing deployments of real-time communications to a fully encrypted and authenticated state.


Alan Johnston (
Bernard Aboba (
Andrew Hutton (
Roland Jesske (
Thomas Stach (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)