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Refer to the exhibit Users report that they receive a fast, busy signal when they...

Refer to the exhibit Users report that they receive a fast, busy signal when they can certain older phone models from their Cisco IP Phone 7821 An engineer checks the call traces and discovers the SDP offer and the error message at the same time as the call failure. What is the cause of the issue?

A.

The called parties are already on an active call.

B.

The called party has configured Cal Forward Al to a blocked number

C.

A codec mismatch causes the voice stream.

D.

The firewall is blocking the voice stream

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