Can anyone recommend a good wireless conference phone that works on a Hosted PBX? Have a client that has a hosted pbx system that wants a wireless conference phone to move from around their office and wants no cable attached. I have used the Polycom analog wireless conference phone before but was wondering if there is something similar in SIP out there that works good. Thanks in advance.

You might take a look at the ClearOne products.

Look at a Grandstream GAC2500

Or you could use a SIP ATA and reuse the Polycom Analog phone.