In {TAIL ~ other embodiments}, {HEAD ~ the primary communications test} includes the issuer of the test request sending yet another message, in response to receiving the test reply 
In
In { TAIL ~ other embodiments } , { HEAD ~ the primary communications test } includes the issuer of the test request sending yet another message , in response to receiving the test reply
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH