[Asterisk-Users] Switchboard interface

[Chris Lee]

I am looking to produce a switchboard interface - hopefully web based
I needs to:
Show the logged in user the CLI of the call they are currently dealing with
Show the number of calls in the queue
Give a number of options for working with the call
    transfer
    put on hold
    etc.
for transfer it must provide a list of users to transfer to.
Allow a call to be initiated

Can anyone give me ideas on how I might interact with * to get this 
informations and provide these services.

Thanks

Chris.