Take one of your extension and connect it to a trunk port and call the extension front another intercom to see if it rings in. If that is successful check the programming on the caller ID for each line. Usually if set, the system will wait to collect all the info from the incoming call before...
You can try replacing the power cord/pack and power strip if any that are connected to the phone system. If there are any broadcasting station or antenna/large dish in the area, this can cause the issue also. Maybe a company in the area that uses CB radio?
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