Changes to existing Asterisk installation

I have an existing Asterisk system up and running with a number of phones for an office. I need changes to this system, I don't have a dev machine so you need to install/configure your own instance and then deploy the changes to our production system once you have confidence in the work. - Asterisk needs to be upgraded to the latest version - We need the ability to back out once you've dialed an extension. I should be able to return to the main menu by dialing '*' during the time an extension is ringing or has been answered by boicemail - I need a recording to be played for specific call queues (sales/billing) when the dept is closed. They are only open M-F from 9am to 6pm - Calling some existing extensions rings 3 times, then goes no where - Some callers show as 'Anonymous' when dialing extensions within the office - Our Polycom conference phone keeps rebooting, it needs a proper caller id label - Voicemail needs to be configured for all extensions