Which digital modulation method is used to transmit caller ID information on analog FXS ports on
Cisco IOS routers?
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A.
DTMF
B.
PSK
C.
FSK
D.
MF
E.
pulse dialing
Explanation:
Link:-http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/vcr1/vcr1-cr-book/vcr-c4.html