Blackboard or another architecture - thoughts please

I have to choose a suitable architecture to develop a system that models an emergency call/dispatch service..

• Calls come in from a person in need.
• Telephone operator records details (Name, location etc).
• System dispatches ambulance from nearest hospital.
• System checks medical database
• System passes medical history and patient info onto a PDA/Smartphone within the dispatched Ambulance.
• Paramedics send update with location and actions taken.

I was thinking that a Blackboard architecture would suit this - but the dispatching of data / client request made, when sending info to the ambulance, would contradict the BB architecture.

I can use both classic, hybrid, emerging or experimental architecture patterns - so long as they work and fit the problem..

Can anyone give me some advice, please?

Observer, possibly chain-of-responsibility as well.

All entities observe the call. If there's any element of a chain of responders who have to decide on wheter to handle or forward a request, you need chain-of-respontibility.