Voice Over Internet __, or VOIP
Puzzle 7 of Day of the Dead Hard Pack
Question is: Voice Over Internet __, or VOIP
and the answer is: PROTOCOL
Word Meaning:
PROTOCOL — (now chiefly historical) The minutes, or official record, of a negotiation or transaction; especially a document drawn up officially which forms the legal basis for subsequent agreements based on it.
Definitions from Wiktionary.