Elite IPK and EliteMail

Here's the scenario:

If a user forwards all calls to another extention or an external cellphone, currently theres no way to transfer calls to the users VM box. Normally you can dial the extention and hit 7, but when forwarded to a cell phone, hitting 7 is the same as calling the cellphone and hitting 7. Is there a way to change the timing to wait a second before forwarding, to let the caller hit 7 and have that register on the phone sytem side and not the cellphone end?

Thanks, Jan