[Sip] Comment on draft-willis-sip-answeralert-01

Hi,

When reading Req-5 with "some sorts of emergency session", I understand
that an "emergency mass alert" is a candidate use-case. 

Thus, in section 6, I suggest a new value for the Alert-Mode header
field: "Amplified" so that as many people as possible are alerted (e.g.
an amplified ring tone). In this case, a UAS could also decide to
increase the volume of audio.

This also brings some potential new requirements for the ECRIT WG: 
- Need for a Public Safety Calling Point?
- Need for the emergency callee to use the "emergency identifier" to
identify an emergency context (in addition of course to the already
mentioned authentication)?

Xavier

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