Your trunk has to be hanging for 7 hours. Are you sure the call was not incoming?
If it was for sure outbound, a temp fix would be to deny the call in ARS.
Disconnect supervision means the CO has the ability to release a trunk when the party at the CO disconnects, and the system is able to recognize the release signal. In general, a CO in the United States provides disconnect supervision for incoming calls but not for outgoing calls. Many other countries do not provide disconnect supervision on either incoming or outgoing calls.
The system must provide the assurance that at least one party on the call can control the dropping of the call. This avoids locking up circuits on a call where no party is able to send a disconnect signal to the system. Internal operations must check to be sure one party can provide disconnect supervision. An incoming trunk that does not provide disconnect supervision is not allowed to terminate to an outgoing trunk that does not provide disconnect supervision.
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