Advances in broadband, wireless and mobile communication systems and their applications are leading the way to the introduction of ubiquitous networks. A military compound infrastructure depicts a good example of an environment where a ubiquitous network can be realized. In this paper we are proposing an integrated architecture for a ubiquitous military compound network that is using a heterogeneous network infrastructure based on fixed LAN (Local Area Networks), the IEEE 802.11 WLAN standards, the IEEE 802.15.4 Zigbee standards. We propose the use of the Session Initialization Protocol as the communication platform for all the event notification, alert and real-time response management. We show how network infrastructure can be integrated as part of ubiquitous network architecture. In this architecture, beside the role of the integrating agent for these different technologies, SIP rises as the enabler for many applications which help mitigate the tasks done by the military personnel and reduce the management overhead. This architecture is intended to mitigate the overhead incurred by the security procedures by providing flexible and real-time communications in a ubiquitous environment.