Which of the following is a feature of SS7?
a. Toll-free services
b. Only nationwide telecommunications
c. Long distance number portability
d. Enhanced call features
a. Toll-free services and d. Enhanced call features
Explanation: The PSTN uses a signaling technique called SS7 that provides enhanced features such as toll-free services, worldwide telecommunications, enhanced call features (for example, call forwarding and three-way calling), and local number portability.
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