Which type of echo is found mostly on tail circuits and is due to reflection that causes the Tx signal
to appear on the Rx signal?

A.
Hybrid echo

B.
Talker echo

C.
Listener echo

D.
Tail-end echo

Explanation:
IntroductionThis document describes how to troubleshoot and eliminate echo where possible inIP
Telephony networks with Cisco IOS® gateways.There are two sources of echo:* Hybrid echo*
Acoustic echoHybrid echo is caused by an impedance mismatch in the hybrid circuit, such as
atwo-wire to four-wire interface. This mismatch causes the Tx signal to appear onthe Rx
signal.Acoustic echo is caused by poor acoustic isolation between the earpiece and
themicrophone in handsets and hands-free devices.