Which of the following is NOT a business phone technology?

Which of the following is NOT a business phone technology?

• SIP
• DNS
• PRI
• PBX 

 

EXPLANATION

Domain name system (DNS) is not a business phone technology. The Primary Rate Interface (PRI) is a telecommunications interface standard used on an Integrated Services Digital Network (ISDN) for
carrying multiple DS0 voice and data transmissions between the network and a user. The Session Initiation Protocol (SIP) is an Internet Engineering Task Force (IETF) standard protocol for initiating an interactive user session that involves multi-media elements, such as video, voice, chat, gaming, and virtual reality. A PBX (private branch exchange) is a telephone system within an enterprise that switches calls between enterprise users on local lines while allowing all users to share a certain number of external phone lines.