Part II. (10%) Short Answer Questions 1. What is the definition of carrier-grade voice service? 2. What is the definition of toll quality? 3. Who invented telephone? 4. What is the US federal government agency that regulates the telecommunications industry in US? 5. What is the emergency call number in Canada? If the UDP port number for RTP is 10000. What is the UDP port number for RTCP? 7. What is the proxy server (product name) used for the NET464 lab exercise? (Its IP address is 140.192.40.20). (Hint: the client is X-lite). 8. How many voice channels (simultaneous calls) can be multiplexed on OC-3? 9. What is the switching technology used on the legacy Public Switching Telephone Network (PSTN)? 10. An example of call feature for the enterprise environment (not for residential service).