Need a logic

Hey i am working on drupal coding,i need a custom module which provide me the functionality below.

I am doing it for call center Mobile web application.

Module Functionality:
(i) Need to track the user accessing the site(It may be from blackberry,Iphone,android,Windows XP,Mac OS).
(ii) I need the connectivity like skype call or Normal call from phone.
(iii) Calling users can record their messages,and we can send it to client's server.
(iv) If time is not in between 9am to 5pm,it will display the audio message.

My efforts:
(i) Using user agents for identify browser.
(ii) http://wurfl.sourceforge.net/ using it
But need to implement a custom module.

Can you help me for bit logic for starting of the modules?