The IESG has approved the Internet-Draft 'Session Initiation Protocol
Extension Header Field for Service Route Discovery During Registration'
<draft-ietf-sip-scvrtdisco-04.txt> as a Proposed Standard. This document is
the product of the Session Initiation Protocol Working Group. The IESG
contact persons are Allison Mankin and Jon Peterson.
Technical Summary
This document defines a SIP extension header field used in
conjunction with responses to REGISTER requests to provide a
mechanism by which a registrar may inform a registering User
Agent (UA), that is, an end-user, of a service route that the UA
may use to request outbound services from the registrar's domain.
SIP has a Route Header which is used to loose source route
messages, and this Service Route extension allows providers to
offer plans in which a user can ensure that they visit a provider's
proxy at which they registered. IETF protocols should neither favor
nor preclude* such capabilities. Security for the user and the
provider are provided by the use of the SIP sips: address of record
mandating that the hops be carried over TLS, and use of S/MIME for
the bodies in the messages.
Working Group Summary
There was active review. This document was split out from
the other direction, called the PATH header and worked on until
it had adequate clarity and security. Its current version has
good consensus.
Protocol Quality
This document has been reviewed for the IESG by Rohan Mahy and
and Allison Mankin. Some implementations were tested in recent
interoperability events.
