5.16. LCR (Least Cost Routing) 
LCR is a collective term for the procedures of routing in a network which allow optimum
control
of the line selection for a connection under mutual interaction.
This routing is based on the user LCOS, the costs of a circuit, the
time of day, the node number, the source group, the restriction table
(destination) and the service. The system determines the available routes
and checks the authorization of the user for using the route.