Hello masters, 
I am a newbie who recently got to know Kamailio. 
I have a scenario and I would like to know if this tool would suit: a central asterisk server with all user accounts and three remote units with Kamailio acting as a proxy. 
Is there any module or configuration that if the central asterisk server fails to respond, would the remote proxies act in survival mode, allowing local communication by users 
until the central asterisk server returns a response?