You do have to be a Vodavi Infinite dealer to get the upgrade chip. There is a cost for the upgrade. It's nominal but you can use the infinite series phone.

I have been installing the STS for awhile now and as stated above there were some issue with the in skin voicemail due to manufacturer problems but things have been ironed out.

We love the system as well. We've been putting alot of these in premium built houses and fits perfectly.

Tip and ring, the work of the devil!