Upon detecting {HEAD ~ user selection} of {TAIL ~ the second contact object}, a communication with the respective caller is initiated via a modality corresponding to the second contact object 
of
Upon detecting { HEAD ~ user selection } of { TAIL ~ the second contact object } , a communication with the respective caller is initiated via a modality corresponding to the second contact object
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH