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Internet Engineering Task Force MMUSIC WG
Internet Draft H. Schulzrinne
ietf-mmusic-sip-url-00.txt Columbia U.
May 14, 1997
Expires: November 1, 1997
SIP URL Scheme
STATUS OF THIS MEMO
This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas,
and its working groups. Note that other groups may also distribute
working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as ``work in progress''.
To learn the current status of any Internet-Draft, please check the
``1id-abstracts.txt'' listing contained in the Internet-Drafts Shadow
Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe),
munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or
ftp.isi.edu (US West Coast).
Distribution of this document is unlimited.
ABSTRACT
A family of new URL schemes, "sip*:", is defined. It is
used to establish multimedia conferences using the
Session Initiation Protocol (SIP).
1 URL Syntax
This URL does not designate a data object, but rather requests the
initiation of a conference with the designated party using the
Session Initation Protocol (SIP) [1]. The details of this conference,
such as the type and parameters of media to be used, are not
specified by this URL but may be negotiated by the protocol itself.
A SIP URL is based on the Common Internet Scheme Syntax described in
section 3.1 of RFC 1738 [2]. It has the general forms:
H. Schulzrinne [Page 1]
Internet Draft sip May 14, 1997
sip://<user>:<password>@<host>,<ttl>:<port>
sips://<user>:<password>@<host>,<ttl>:<port>
sipt://<user>:<password>@<host>,<ttl>:<port>
sipu://<user>:<password>@<host>,<ttl>:<port>
The " :<password> ", " ,<ttl> ", " :<port> " parts are optional. If
the port is omitted, then port TBD is assumed for schemes sip: ,
sipu: , and sipt: and port TBD for scheme sips:
The URL scheme name also designates the transport protocol to be used
by SIP. For sip: , either UDP or TCP may be used, depending on the
preference of the entity resolving the URL. sipu: and sipt:
explicitly request use of UDP and TCP. sips: requests use of SSL
over TCP.
The ttl value designates the multicast time-to-live value. This field
MUST NOT be used if the host part of the URL is a unicast address.
The default value is one. The ttl value is mandatory if the host
address designates an IPv6 multicast address. (The textual
representation of IPv6 addresses contain colons and thus cannot be
delineated from the port identifier.)
2 SIP URL BNF
The following BNF includes the generic definitions of RFC 1738,
Section 5.
sip_URL = ( "sip:" | "sips:" | "sipt:" | "sipu:" ) "//" login
login = [ user [ ":" password ] "@" ] host_ttl_port
host_ttl_port = host [ "," ttl ] [ ":" port ]
ttl = digits
3 Author's Address
Henning Schulzrinne
Dept. of Computer Science
Columbia University
1214 Amsterdam Avenue
New York, MY 10027
USA
electronic mail: schulzrinne@cs.columbia.edu
4 Bibliography
H. Schulzrinne [Page 2]
Internet Draft sip May 14, 1997
[1] M. Handley, H. Schulzrinne, and E. Schooler, "SIP: session
initiation protocol," Internet Draft, Internet Engineering Task
Force, Mar. 1997. Work in progress.
[2] T. Berners-Lee, L. Masinter, and M. McCahill, "Uniform resource
locators (URL)," RFC 1738, Internet Engineering Task Force, Dec.
1994.
H. Schulzrinne [Page 3]