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Problem with PA system off FXS port

I have a 3825 voice gateway router with a Valcom public address system off of one of its FXS ports.

When users dial 89 from any phone, it is forwarded immediately to the PA system.

voice-port 1/0/23

timeouts initial 60

timeouts interdigit 60

timeouts ringing infinity

dial-peer voice 89 pots

  destination-pattern 89

  port 1/0/23

(we are using Cisco UCM 6, and the software version on the router is 12.4(11))

Periodically, when a user activates the PA system, we will hear loud beeping, and the tranmission is interrupted. Thinking there was an issue with the Valcom, I replaced it, and also replaced some wiring, but the beeping remains. Reloading the gateway restores functionality.

Does anyone have any idea what might be wrong here?

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Hall of Fame Super Gold

Problem with PA system off FXS port

Update IOS.

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