On circuit switched portions of a PSTN,what set of standards established by the ITU is used to handle call signaling?
A)MCU
B)H.323
C)H.225
D)SS7

Question

Quizplus · Accepted Answer

SS7 (Signaling System 7) is the set of signaling protocols used on circuit switched portions of PSTN to handle call signaling. It is defined by the ITU-T (International Telecommunication Union - Telecommunication Standardization Sector). MCU (Multipoint Control Unit) is used for video conferencing, H.323 is a set of protocols for multimedia communication over IP networks, and H.225 is a part of the H.323 protocol suite that deals with call signaling. None of these are used for signaling on circuit switched portions of PSTN.

On Circuit Switched Portions of a PSTN,what Set of Standards