signal processing means for performing {HEAD ~ call processing} based on {TAIL ~ said unique call signal}; and 
based on
signal processing means for performing { HEAD ~ call processing } based on { TAIL ~ said unique call signal } ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH