Call Routing

The following describes call routing:

A routing request results in an HTTP error response if no routing is available.
A routing request from a source node which has an alternate route option returns the next alternate route option. The call route is not recalculated. If the alternate route list is empty, a 404 result is returned.
A routing request from a node which is not the source node returns the next hop in the routing chain according to the original route selection. The routing logic is not performed again.