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E&M ports are not used to connect end user devices, instead FXO ports are. E&M ports are the most common form of analog trunk circuits, which uses special signaling paths that are separate from the trunk's audio path to convey information about the calls. E&M connections from routers to telephone switches or to PBXs are preferable to FXS/FXO connections because E&M provides better answer and disconnect supervision.
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