You cannot use an "in skin" voicemail when you network these systems for a centralized voicemail. Unfortunately, like it's i-series cousin when you put an external voicemail on it, it's SLOW. If you can live with this great, we sell NEC Aspires and when someone says networking and centralized voicemail we turn to Tadiran ie Sprint Flexicom. While the Aspire is impressive for it's price there are pitfalls as I have seen first hand networking them. Another example of the difference between a true PBX and a Hybid I am afraid.