How do I change my voice mail number on my Qwest landline?

I would like to alter the number of my voice mail on my Qwest landline. Instead of connecting callers to my Qwest voice mail box when I fail to answer, I would like callers be to forwarded to a separate phone number where I set up a voice mail box. Is this possible and if so how do I go about doing it?How do I change my voice mail number on my Qwest landline?
I believe that you would need Call forwarding. Call Customer Service at Qwest and ask them how to do this.