Cisco 400-051 Exam

Which digital modulation method is used to transmit caller ID information on analog FXS ports on Cisco IOS routers?

  • A. DTMF
  • B. PSK
  • C. FSK
  • D. MF
  • E. pulse dialing
Answer: Option C.
Explanation: 

Reference:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/vcr1/vcr1-cr-book/vcr-c4.html

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