This can happen if you transfer a call from outside to another outside line, or if somone has their phone set to forward to an outside line (like a cell phone)
Also, if you do not have "Disconnect Supervision" on your trunks and "Clear on Disconnect" (COD) set by the phone company, this can happen.
This sort of fix is usually done by a telephone professional, but you can do it if you specify the model number of the PBX that you have.
To clear the lines, you either need to reboot the PBX or temporarily disconnect the lines from the PBX.
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