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This is a network setting and need sot be altered in the call divert setting menu.
Under Tools> Settings> Call divert> voice calls look for the option "if not answered" set it to activate and put in your networks divert number then select the delay time of your choice with the max time being 30 seconds.
This should solve your issue
iPhone 4S 16GB MacBook Pro 17" Mac OS X Lion 10.7.3
Thank you for your help with this problem. I have gone thru and checked all of this and it comes up with conflict error in IF BUSY and IF NOT AVAILABLE. I am not sure what to do, any suggestions please?? Many thanks