System for assisting in controlling real-time transport protocol flow through multiple networks via use of a cluster of session routers

The system with which control of the real-time transport protocol flow which passes along two or more networks which used the session router group by screening is assisted is shown. This system consists of the 1st computer and computer group, and this computer group consists of at least two related computers linked to the 1st computer. A related computer is equipped with the 2nd memory and 2nd processor that store the logic by which each defines the function performed by the 2nd transceiver and related computer. The 2nd processor can perform the following function by the 2nd memory. In namely, the route information received by computer related from the 1st computer, It determines whether to abandon the function to perform the screen in a boundary, and the above-mentioned receiving route information, The function in comparison with the local policy defined within the computer group in this receiving route information and route information by which the screen was carried out when route information was not abandoned, It is the function to perform the screen outside a boundary in front for this receipt information and information by which the screen was carried out rather than transmitting this receipt information and information by which the screen was carried out to the exterior of this computer group.