EAP Session Policy

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					Response to Call Back questions

           IETF 77 – Anaheim
          Stephen McCann, RIM
• Document contains some RIM responses to the 5
  questions from Hannes Tschofenig, regarding Call
  Back behavior.
                Call Back Q1
• What functionality is available in today's CS

• Disabling ‘a’ party clear is likely to be
  implemented in some countries but we are unsure
  of which countries.
                Call Back Q2
• Is this useful functionality to have for IP-based
  emergency services?

• The procedures in place for CS based emergency
  services should be at least the same as for IP
  based emergency services.
                Call Back Q3
• Do you envision a time-restriction on this
• Example: only within one hour callbacks from the
  PSAP are treated differently to normal calls.?

• The call back time needs to be configurable as it
  is likely to be a national matter. In some countries
  it may be zero.
               Call Back Q4
• Would you expect the call to reach primarily the
  device that initiated the emergency call?

• The call back should reach the device that made
  the emergency call.
                       Call Back Q5
•   In some cases the device that was used to originally initiate the call
    does not respond anymore to a callback (e.g. imagine a fixed line
    phone that was used to report a fire in a house and is out of order
    soon afterwards). Since the initial emergency call provided a second
    contact mechanism (namely the address of record) it could be used by
    the call taker as well. Should this communication also experience the
    same type of override privilege as the initially transmitted callback to
    the emergency caller's device ?

•   PSAP’s and emergency response services should be free to use
    whatever means is appropriate and at their disposal to contact the
    caller. It is beneficial for the caller’s device to provide more
    information than the minimum required to the PSAP about location,
    identify and alternative call back options.
          Additional use case
• An emergency situation may change and the
  caller awaiting a PSAP call back may desire that
  the call back is made requiring the intervention of
  the called user or without first alerting.
• Such a capability could be available for a limited
  time. Imagine someone such as a kidnapped
  person reporting that their life is in danger.

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