When a caller dials 9 plus an external seven-digit number, the caller hears a fast-busy tone after a period of silence. What is causing the silence?

When a caller dials 9 plus an external seven-digit number, the caller hears a fast-busy tone after a period of silence. What is causing the silence?
A. There is no dial route for 9XXXXXXX on Cisco Unified Communications Manager.
B. The gateway is not dropping the leading 9, and the PSTN fails.
C. The T302 timer is waiting to expire.
D. The caller does not have the PSTN partition in the CSS.
E. The caller dialed the wrong number.
F. To dial successfully, the caller must enter a Forced Authorization Code.

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