A network technician is considering opening ports on the firewall for an upcoming VoIP PBX implementation. Which of the following protocols is the technician MOST likely to consider? (Choose three.)
SIP, H.323, and RTP are the most correct answers.
Session Initiation Protocol is used for multimedia communication sessions.
H.323 is used to define how real-time audio, video and data information is transmitted. It provides signaling, multimedia and bandwidth control mechanisms over RTP.
Real-time Transport Protocol is a packet-formatting standard for delivering audio and video over the Internet, and is popularly implemented for VoIP solutions.
NTP is incorrect; Network Time Protocol's functions are not relevant to a VoIP PBX.
SMB is incorrect; Server Message Block is a Windows protocol for sharing access to files and printers between hosts.
ICMP is incorrect; Internet Control Message Protocol is not relevant to the functions of a PBX.
IPsec is incorrect; IP security is not relevant to the function of the PBX.
RDP is incorrect; Remote Desktop Protocol features are not relevant to the function of the PBX.
Session Initiation Protocol (SIP) is used to signal and control interactive communication sessions. The uses for such sessions include voice, video, chat and instant messaging, as well as interactive games and virtual reality.
H. 323 was the first VoIP standard to adopt the Internet Engineering Task Force (IETF) standard Real-time Transport Protocol (RTP) to transport audio and video over IP networks.
Real-time transport protocol (RTP) is a way of structuring data packets so that they can be delivered across the internet at lightning speeds and reassembled into a smooth flowing stream suitable for delivering voice or multimedia in a natural way. Without such a protocol, voice over IP would be impossible
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