Mobility Management in Disadvantaged Tactical Environments

Reliable Session Initiation Protocol

“…Since the main function of the SIP is to provide signalling between two communication hosts, the challenges include how to let each host know where the other host is, how to connect to each other, and how to keep a session alive with or temporarily without the help from its home network. To solve this problem, a reliable SIP message forwarding mechanism [Zheng and Wang, 2007] has been proposed. The next section will present the details.…”

“…In order to overcome the problem of unreliable registration in the SIP mobility support, a chain-based SIP signalling (CBS) mechanism has been proposed (Zheng, H. & Wang, S. 2007), which increased the signalling reliability by adopting Mobility Agent(s) to construct a signalling chain that facilitated a reliable signalling.…”

“…The inter-domain SIP mobile handling is still based on the standard SIP mobility by sending "re-INVITE" messages to the home SIP server. (Zheng, H. & Wang, S. 2007) proposed an idea of using a chain of mobility agents that traverse multiple domains. It proposed that SIP mobile agents could exist in each domain along a routing path that was from a mobile host to its Home SIP Server.…”