Offering a caller an option of leaving a voicemail or press a button to get an Assistant,Routing Calls to an Assistant via voicemail.

Is there a way that an Advisor can say in his voicemail - "To speak to my Assistant, please press (and then either type the extension or press a number that automatically goes to said Assistant)? Giving the caller an option to leave a voicemail or switch over to the Assistant.

Is there a way an Advisor can say in his voicemail, "To reach my assistant, please press (and then say a number or an extension)? but not having his phone automatically forward to said assistant? Giving callers the option to leave a voicemail or talk to assistant instead.