| Summary: |
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.
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