I have a US account. We are a small AV rental business with a main office and a secondary warehouse. I am looking for a way to add a second phone to my extension with out adding another line to our account. I am the only person in our secondary warehouse, and it is too large for my desk phone to cover. I am looking to add a wireless handset to my extension. I tried the Yealink W52P but it does not cover our needs as it does not support presence. I cannot add a second desk phone and use the shared line feature as I would not have voicemail or personalization on the line. I would like to use the Polycom VVX-D60, but the VVX-41-0 need to have FW 5.4.3, which it does not look like RC has pushed. We are not big enough to justify adding an additional line for a second phone in the warehouse, and even if we did I have not found a stand alone wireless hand set that supports presence. The VVX-D60 is the only handset I have seen that covers our needs. So I need to know if the phone will work with the FW on the phone currently (which I am told it will not), if RC can make the D60 work, or if I buy a VVX410 from a third party without the RC version of software to pair with the D60, what features do I loose and does this put me back to where I was with the W52P?