Patent ID: 7336663

Claim:
A resource reservation protocol substitute reply router transferring a verification message transmitted from a transmission host to a reception host for acquiring guarantee of service quality of a transmission route upon transmitting data packet from said transmission host to said reception host, comprising: judgment means for monitoring a response message from said reception host for said verification message and making a judgment whether said reception host is an equipment supporting said resource reservation protocol or not; and substitute resource reservation protocol control means for executing a procedure of resource reservation protocol on behalf of said reception host which is judged as not supporting resource reservation protocol; and reservation means for making reservation of resource on the route to said transmission host, wherein said judgment means monitors an internet control message protocol message, and makes judgment whether said reception host is an equipment supporting said resource reservation protocol or not from said internet control message protocol message; wherein said internet control message protocol message is the response message from said reception host for a Path message of resource reservation protocol that is transmitted as the verification message and transmitted to a sender of a data packet upon receipt of a packet of a not supported protocol.