If the phone doesn't ring when called by the extension number of the phone then try to use the volume up button while someone is calling the phone. The volume is a multi-purpose button that doubles for phone volume and ringer volume. However, the only way to turn up the ringer is when a call is coming into the phone.
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If the phone doesn't ring when called by the extension number of the phone then try to use the volume up button while someone is calling the phone. The volume is a multi-purpose button that doubles for phone volume and ringer volume. However, the only way to turn up the ringer is when a call is coming into the phone.