I'm thinking of getting the above device with more than one handset. Present environment is Asterisk with two wired SIP phones. I'd like to go DECT with the Siemens phones, but don't know if it can treat each handset as a true separate extension. If, for example, I have one Siemens handset in the bedroom and another one in the garage, is it possible to call only the bedroom handset from one of the two wired SIP phones?