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If one wants to implement an emergency service based on Call Queueing/Displacement, on "prioritized access to network layer resources", and ensures that "Emergency-1" sessions can preempt "Emergency-2" sessions, but non-emergency sessions are not affected by preemption, one can do that by signaling emergency calls: * using "Resource-Priority" Header in SIP * using Admission-Priority Policy Element in RSVP * using Preemption Policy Element in RSVP with: o setup(Emergency-1) > defending(Emergency-2) o setup(Emergency-2) <= defending(Emergency-1) o setup(Emergency-1) <= defending(Non-Emergency) o setup(Emergency-2) <= defending(Non-Emergency) Etc... Dealing with various flavors of Emergency services (eg without/with/with-limited preemption, with/without call queueing, with/without call displacement) |