The caller preferences specification for the Session Initiation
Protocol (SIP) allows a caller to express preferences that the call
be routed to a User Agent (UA) with particular capabilities.
Similarly, a specification exists to allow a UA to indicate its
capabilities in a registration. Amongst those capabilities are the
type of media streams the agent supports, described as top-level MIME
types. The 'application' MIME type is used to describe a broad range
of stream types, and provides insufficient granularity as a
capability. This specification allows a UA to indicate which
application sub-types the agent supports.
Working Group Summary
This document is a contribution by an individual. The SIPPING
working group was aware of this document (it was discussed as
part of the set of service identification documents in the
IETF68 and IETF69 timeframe) and the plan to advance
it as an individual submission.
While not a working group item, the document has received
attention from key SIP and SIPPING working group members.
Robert Sparks is the responsible Area Director