This application describes a system and associated method for routing messages, such as phone calls. The destination of incoming calls may be determined based on a variety of factors, such as the state of the callee's security system, the date and time, the identity of the caller, and the number of recent call attempts by the caller. Potential destinations include all or a subset of the phones associated with a subscriber and outside phones, such as cellular phones operated by third parties. The rules used to route calls may be defined or modified via a web interface.