Tech quiz of the day from WhatIs.com: How much do you know about SIP trunking?

The WhatIs.com Word of the Day is SIP trunking.

Tech Trivia
Like HTTP or SMTP, SIP works in the ___________ layer of the Open Systems Interconnection (OSI) communications model. What is it?
Answer

Secret Word of the Day
Elephants have ‘em, people swim in them and you’ll find them on the luggage rack. In IT, it’s a line or link designed to handle many signals simultaneously. What’s the secret word?
Answer

IT Acronym Challenge
SIMPLE is a protocol that applies SIP to unified communications. What does SIMPLE stand for?
Answer