System and method for sending data using caller ID

A communication system receives data that does not pertain to an attempted initial establishment of a communication. The communication system uses a new message format under an existing analog Caller ID standard. The communication system inserts the data (which can be in addition to existing Caller ID data) into a Caller ID message that uses the new message format. The communication system then sends the Caller ID message to a communication device/Private Branch Exchange (PBX)/contact center that can interpret the new message format. The communication device/PBX/contact center can use the data to further route the communication to a specific telephone and/or can use the data to display information such as Global Positioning System (GPS) coordinates of a cell phone. The data can enhance the capabilities of devices and systems that currently work under the Public Switched Telephone Network (PSTN).