The adapters are intended to be used for {HEAD ~ calls} coming into {TAIL ~ a PBX} on a DID trunk or E&M tie line 
coming into
The adapters are intended to be used for { HEAD ~ calls } coming into { TAIL ~ a PBX } on a DID trunk or E&M tie line
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH