A Private GSM Cell?

mr number two asks: "I live in the mountains and have poor GSM reception. I can buy an active repeater to boost signal strength in my home to good levels, but what I'd really like to do is have a private GSM picocell, such that at home I would be connected to my own PBX. Calls to my home phone number would ring through to my cell phone. I wouldn't have to worry about a home cordless phone (and 802.11 interference) and I'd have all my speed dialing / contacts info right there. There are many other benefits. Ignoring FCC licensing issues, is there a base station I can purchase which has a signalling interface that will interface to a small PBX?"