2 Voicemail recordings per person [INTERNAL] or [EXTERNAL]

I am curious if it is possible for asterisk 1.4 to have multiple voice messagebox recordings, one for internal callers and one for external callers.

When an internal caller recieves a voicemail message they are provided with the recording instructing which Internal extension can be reached instead of them while they are away.

When an external caller dials the same person they should be provided with a recording specifying the full extension number of who to reach while the caller is away.

Is this feature available in 1.4 or is it being introduced in 1.6?
Currently our Voicemail gets emailed to the users inbox (viewed in Lotus Notes) and the internal numbers are resolved against our LDAP.

Any assistance on this would be greatly appreciated