The world's public switched telephone networks, both wireline and mobile, communicate with each other by means of a signaling protocol known as __________________

A. private branch exchange (PBX)
B. Signaling System 7
C. public switched telephone network (PSTN)
D. public data network (PDN)


B

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A. pour B. slab C. grade-to-slab D. slab-on-grade

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What will be an ideal response?

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Answer the following statement true (T) or false (F)

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Answer the following statement true (T) or false (F)

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