- field - specifies which string to be matched.
- subject - the subject of the call.
- organization - the organization of the originator of the
call.
- user-agent - the name of the program or device with which
the call request was made.
- language - the language in which the originator of the
call wishes to receive responses. This contains a list of RFC 1766[9]
language tags, separated by commas.
- display - free-form text associated with the call, intended
to be displayed to the recipient, with no other semantics defined
by the signalling protocol.
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