Tom,
Can you put this comment into the queue for the draft:
S4. Integrity: Implementations MUST provide mechanisms
that ensure
the integrity of IP protocol components that are crucial to
providing reliable emergency call service. (This requirement
implies authentication of the caller to allow
integrity protection
of the request and authentication of the PSAP to allow
integrity
protection of responses.)
Do not intertwine integrity with authentication. You can integrity
protect a communications without knowing who you are communicating with.
Mike