1. Which of the following describes the technique of digitizing analog voice?
a. Private Branch Exchange
b. Public Switched Telephone Network
c. Pulse Code Modulation
e. Voice shaping
2. PSTN networks can scale up to only several hundred users.
3. Which of the following is NOT a PSTN service?
a. Call center services
b. Virtual private voice networks
c. Interactive voice response
e. Voice mail
4. Which modern Cisco router family integrated data and media collaboration features?
5 . . .
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