tmobile wifi voice calls

[Carl Karsten]

"Make and receive unlimited nationwide calls over Wi-Fi with your home phone." 
http://www.t-mobile.com/shop/plans/cell-phone-plans-detail.aspx?tp=tb1&rateplan=T-Mobile-@Home

Anyone know if the FR will work with whatever VoIP protocol t-mobile uses?  does 
anyone even know what protocol it uses?   I found this:

"The technology T-Mobile is using is called Unlicensed Mobile Access, or UMA. 
UMA takes the protocol used by GSM handsets and encapsulates it into an IPSec 
VPN for transmission over the public Internet. The VPN is authenticated using 
the subscriber's SIM card via a protocol called EAP-SIM." 
http://www.voip-weblog.com/50226711/is_the_linksys_wrtu54g_voip.php

Carl K