The use of a Zigbee network in various health monitoring systems has become well accepted. This network promises to develop health care by allowing prompt, secure, low power, and low-cost health monitoring with real-time medical data transmission and update via the session initiation protocol (SIP). In this paper, we present a description and system architecture for a ubiquitous ECG monitoring system based on SIP and the Zigbee Network. Our proposed ubiquitous ECG monitoring system includes a wireless ECG sensor, ECG console, a Zigbee module, a SIP registrar and proxy server, a database server, and wireless devices for users. This system specifically targets patients, senior citizens, and others who may benefit from continuous, Remote health monitoring systems. We performed an evaluation of the results of this research through an ECG monitoring system design and experimentation with a pervasive computing test bed.