SIP: Session Initiation Protocol ◾ 183
Mobile Agent Communication Using SIP
Reliable communication protocols can integrate SIP as a signaling protocol—
for example, a Synchronous Invite Model (SIM) and Asynchronous Subscribe
& Notify Model (ASNM) to establish a framework for inter-agent communica-
tion [12]. Both of them can solve “communication failure and message chasing”
problems [12]. Two communication problems are inherent in the mobile agent
communication:
1. Communication failure: Defined as a message delivered to the host that the
receiver agent stays; receiver agent has migrated to the next host [12]. us,
the receiver agent receives unsuccessful messages. It is not guaranteed that
the receiver host can get all mes ...