While I am not exactly sure of your scenario, there are ways of being able to modify call handling and remotely as well. Craig has a few ideas, but I am a liitle confused as to why, during normal office hours would the recptionist extension be unattended and more so that if such is the case, then why a need to change from a remote location?
You do not indicate how calls come to the recptionist in the first place nor what happens if that person does not answer the call within the allowed timeframe or if already busy. As you indicated that normal office hours are in effect, then Craig's suggestion of forciing the system to in or out based upon dial codes impacts all extensions and not just the operator.
You of course realize that you can forward to another number (external or internal extension) without the need to make a recording. A status change can do this using dial codes or as craig suggested, using myPhone.
In any event, more info is really needed to better understand what the issue is and how you would like to resolve.