A system and method for authentication of a communication device is disclosed. A system that incorporates teachings of the present disclosure may include, for example, an authentication system can have a controller element that receives from a communication device by way of a packet-switched network an authentication request comprising a first identification (ID) of a gateway and a second ID of the communication device. The gateway and at least one network element of the packet-switched network can be provisioned to have a physical association with each other such that other network elements of the packet-switched network deny services to the gateway when the gateway attempts to operate outside of said physical association. From said physical association and the aforementioned IDs the controller element can authenticate the communication device. Additional embodiments are disclosed.