An optical module includes a housing including a groove part formed inside the housing; and a receptacle received in the housing, the receptacle to which an optical connector having an optical fiber is connected, the receptacle including a brim part and a stub part where the brim part is formed in a body. A claw mechanism is driven out of the sway braces into the article to hold the article in place on the sway braces. The propagation delay is then mapped to a stored closest corresponding radial geographic billing location, and the call is then associated with the closest corresponding radial geographic billing location.