How to detect a session-agent's availability
Hi,
I am trying to detect the state of a SIP endpoint (configured as a session-agent). This state can be up or down. In the up state it answers SIP-Request and will probably answer ICMP echo requests (ping). In the down state it will behave as it is powered off. The session-agent is not directly attached to the Net-Net-SD, but can be reached via (L3)-routing.
I would like to achieve the following behaviour: The Net-Net-SD should react if the session-agent is unreachable (down, no answers at all) and then return something like 5XX to the core-site (where the SIP-message originally came from), as ist was described