Internet DRAFT - draft-johansson-sip-alpn
draft-johansson-sip-alpn
Internet Engineering Task Force O.E.J. Johansson, Ed.
Internet-Draft Edvina AB
Intended status: Standards Track 21 February 2022
Expires: 25 August 2022
TLS ALPN usage in the Session Initiation Protocol (SIP)
draft-johansson-sip-alpn-03
Abstract
Many SIP specifications use other protocols in addition to the core
SIP protocol, like HTTP and MSRP. In order to be able to use
multiple protocols on the same port with TLS, a TLS Application
Protocol Negotiation Extension (ALPN) protocol ID is needed (RFC 7301
[RFC7301]). This document registers "sip/2" as the ALPN protocol ID
for the SIP protocol version 2.0.
Status of This Memo
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This Internet-Draft will expire on 25 August 2022.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. ALPN registration . . . . . . . . . . . . . . . . . . . . . . 2
3. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 2
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2
5. Security Considerations . . . . . . . . . . . . . . . . . . . 2
6. Normative References . . . . . . . . . . . . . . . . . . . . 3
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Introduction
A modern SIP server not only supports the Session Initation Protocol
v2.0 (RFC 3261 [RFC3261]), but also needs to support HTTP and
possibly other related protocols, like MSRP. To reduce the number of
ports used, a SIP server supporting Transport Layer Security (TLS)
can support multiple protocols on the same port, provided the clients
signal protocol usage with ALPN.
2. ALPN registration
Registration following the specification in RFC 7301 [RFC7301]
* Protocol: SIP
* Identification Sequence: 0x73 0x69 0x70 0x2f 0x32 ("sip/2")
* Reference: RFC 3261
3. Acknowledgements
This document was inspired by registration feedback from Rich Salz.
4. IANA Considerations
This document registres a new ALPN in the "Application-Layer Protocol
Negotiation (ALPN) Protocol IDs" registry under the existing
"Transport Layer Security (TLS) Extensions" heading.
5. Security Considerations
This document modifies the behaviour of compliant SIP servers when
being used by compliant SIP implementations (servers and clients).
It does not add any known security issues to the protocol.
For security considerations related to usage of ALPN in TLS, see
RFC 7301 [RFC7301]
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6. Normative References
[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
A., Peterson, J., Sparks, R., Handley, M., and E.
Schooler, "SIP: Session Initiation Protocol", RFC 3261,
DOI 10.17487/RFC3261, June 2002,
<https://www.rfc-editor.org/info/rfc3261>.
[RFC7301] Friedl, S., Popov, A., Langley, A., and E. Stephan,
"Transport Layer Security (TLS) Application-Layer Protocol
Negotiation Extension", RFC 7301, DOI 10.17487/RFC7301,
July 2014, <https://www.rfc-editor.org/info/rfc7301>.
Author's Address
Olle E. Johansson (editor)
Edvina AB
Sollentuna
Sweden
Phone: +46 8 5000 1625
Email: oej@edvina.net
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