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Hello, I have attached a public address system to an slt port on the system however when the message has been broadcast the extension attached to the PA does not clear down. I assume it is to do with the CPC signalling however I can't find the appropriate MMC code to disable it. Any help would be appreciated. Thanks.

Why would you not use the external paging port?

Hello apologies for the delay in responding. Without confusing the issue too much the external paging port is already in use.

Do you have a spare analog co port to use instead? Not sure you are going to achieve this cpc control from a digital to an analog station port.

Unfortunately no spare analogue line port. I may be using the incorrect terminology. What happens when the PA message is ended the speakers then continue to broadcast what I would describe as quite fast interupted dial tone

Exactly because you are hanging up on the sli port and it stays off hook. The only way I think the system can send a disconnect to a sli port on hang up is if the sli port is programmed as a vmail port. In North America it would be mmc 207 assign VM/AA Port


My only other suggestion is to use a spare digital phone and tap the speaker output and feed it into a pa amplifier.

If you have a misc card you get a 2nd.external paging port plus some relays you can use.