| MMUSIC | S. Nandakumar |
| Internet-Draft | Cisco Systems Inc |
| Intended status: Standards Track | September 18, 2014 |
| Expires: March 22, 2015 |
IANA registration of SDP 'proto' attribute for transporting RTP Media over TCP under various RTP profiles.
draft-nandakumar-mmusic-proto-iana-registration-00
RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. The data transport is augmented by a control protocol (RTCP) to allow monitoring of the data delivery in a manner scalable to large multicast networks, and to provide minimal control and identification functionality.
This document describes how to express RTP media transport over TCP in SDP (Session Description Protocol) under various configurations. This document defines 'TCP/RTP/AVPF', 'TCP/RTP/SAVP', 'TCP/RTP/SAVPF', 'TCP/TLS/RTP/SAVP', 'TCP/TLS/RTP/SAVPF' protocol identifiers for SDP.
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SDP (Session Description Protocol) [RFC4566] provides a general-purpose format for describing multimedia sessions in announcements or invitations. [RFC4145] specifies a general mechanism for describing and establishing TCP (Transmission Control Protocol) streams with [RFC4571] defining a method for framing Real-time Transport Protocol (RTP) and RTP Control Protocol (RTCP) packets onto a connection-oriented transport (such as TCP) . [RFC4572] extends [RFC4145] for describing TCP-based media streams that are protected using TLS (Transport Layer Security).
The RTP specification [RFC3550] establishes a registry of profile names for use by higher-level control protocols, such as the Session Description Protocol (SDP), to refer to transport methods. This document describes the following new SDP transport protocol identifiers for transporting RTP Media over TCP.
TCP/RTP/AVPF: to describe RTP Media with RTCP-based Feedback [RFC4585] over TCP.
TCP/RTP/SAVP: to describe Secure RTP Media [RFC3711] over TCP.
TCP/RTP/SAVPF: to describe Secure RTP Media with RTCP-based Feedback [RFC5124] over TCP.
TCP/TLS/RTP/SAVP: to describe Secure RTP Media [RFC3711] on top of TLS [RFC5246] over TCP.
TCP/TLS/RTP/SAVPF: to describe Secure RTP Media with RTCP-based Feedback [RFC5124] on top of TLS over TCP.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].
The 'm' line in SDP specifies, among other items, the transport protocol to be used for the media in the session. See the "Media Descriptions" section of SDP [RFC4566] for a discussion on transport protocol identifiers.
This specification defines new protocol identifiers 'TCP/RTP/AVPF', 'TCP/RTP/SAVP', 'TCP/RTP/SAVPF', 'TCP/TLS/RTP/SAVP', 'TCP/TLS/RTP/SAVPF' which indicates that the media described will use TCP as the transport protocol.
An 'm' line that specifies these new proto identifiers MUST further qualify the application-layer protocol using an fmt identifier.
This document describes five new proto values: 'TCP/RTP/AVPF', 'TCP/RTP/SAVP', 'TCP/RTP/SAVPF', 'TCP/TLS/RTP/SAVP', 'TCP/TLS/RTP/SAVPF' as defined in the section Section 3. These proto values should be registered by the IANA under "Session Description Protocol (SDP) Parameters" under "proto".
The new "proto" identifiers registered by this document in the SDP parameters registry maintained by IANA is primarily for use by the offer/answer model of the Session Description Protocol [RFC3264] for the negotiation and establishment of RTP based Media over the TCP transport. These additional SDP "proto" identifiers does not introduce any security considerations beyond those detailed in Section 7 of [RFC4566].
Author would like to thank Cullen Jennings and Alissa Cooper for their early reviews and suggested improvements.
| [RFC2119] | Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. |
| [RFC4566] | Handley, M., Jacobson, V. and C. Perkins, "SDP: Session Description Protocol", RFC 4566, July 2006. |
| [RFC4571] | Lazzaro, J., "Framing Real-time Transport Protocol (RTP) and RTP Control Protocol (RTCP) Packets over Connection-Oriented Transport", RFC 4571, July 2006. |
| [RFC4572] | Lennox, J., "Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP)", RFC 4572, July 2006. |