You could add the words "After-Hours Service" or "After-Hours Line" after the company's name. That way there's no concern over whether it is indeed a number that reaches a real person who will return their call during non-business hours. It's a way to let them know they're on the right track. If that makes sense. :)
Hello. You have reached Erin Klineman, Marketing Manager for Stone & Associates. I am currently out of the office attending a conference until August 4th. I will be checking messages daily, however, if you need immediate assistance, please contact Marketing Specialist, Michael Kim at extension 240. Otherwise, please leave a message, and I will call you back at my earliest opportunity.

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