A method is provided for operating a directory assistance system is provided that includes the arrangement for storing a plurality of directory listings including listings relating to identification of Voice over IP devices. The directory assistance system is configured to receive a directory request for one of said directory listings from a variety of callers employing landline. The directory assistance system retrieves the requested information and generates a call completion record for providing information responsive to said directory request. The call completion record includes information relating to a Voice over IP device in a case wherein the requested information relates to a Voice over IP device. The call completion record includes information relating to a mobile phone device in a case wherein the requested information relates to a mobile phone device. The call completion record includes information relating to a landline device in a case wherein the requested information relates to a landline device.