What is the reason why the landline in the hotel room can only be answered but not called?

There is a set limit at the front desk, or go to the front desk switch for testing. If there is a problem, check the equipment. If there is no problem, check the line from the device to the room phone. This can't be played inside or outside.

This can only be done inside, not outside. Generally, the internal line of a hotel is an internal call service, and the external line is inside or outside the city. Most ordinary hotels allow you to make local calls and external calls (that is, long-distance calls). Some of them need to be paid, so ask the front desk to help you open long-distance telephone service.