If you’re new to the world of SIP trunking, no doubt you’ve seen a lot of lingo that may not make sense at first. Well, we’ve gathered a list of key terms followed by a list of key initialisms and acronyms that will help you make sense of SIP trunking.Voice over internet protocol, also known as IP telephony, is where communication services such as voice, fax, SMS, and voice messaging happen over the public internet rather than the public switched telephone network.