Exhibit:

An IP Phone user hears echo caused by hybrids in a PSTN network. What is the best solution?

A.
Use a load ID on the IP Phone, which includes echo suppression on the handset and headset.

B.
Configure and verify echo cancellation operation on a Cisco IOS gateway.

C.
The cause of echo is on the PSTN side, so you need to contact the individual PSTN.

D.
Configure the echo canceler coverage to a value less than the time the echo needs to return to the gateway.