Motorola NVG510 & Registering 3rd Party SIP Anyone have any info on how to register a 3rd party SIP provider within the Motorola/AT&T NVG510. I currently use Phonepower.com as a "home phone" provider. AT&T offers basic 6MB Uverse, but not Uverse voice here. That's fine with me, but I would like to register my SIP data in the AT&T provided device... if for no other reason, it would be one less device to maintain and power. Anyone know about or have info about any "hacks", ROM updates, etc... for "admin" or "root" access to this device? Many thanks in advance!