Need to change voice mail option

Currently, if a client calls and reaches voice mail, they are routed to extension 102 in
side our office.

I need to change the routing to extension 101. How do I do that?

Please respond with easy instructions. I am brand new at this.

Thanks for your help.

What kind of system is this? What kind of lines are you using?

Have reviewed any of the documentation under the “resources” column?