Patent ID: 7054308
Filing Date: 2006-05-30
Classification: H04L

Abstract:
1. A method for estimating the grade of service (GoS) and offered traffic for voice over internet protocol (VoIP) calls at a gateway bridging calls between a public switched telephone network and an internet protocol network, the gateway having a dial-control management information base, the method comprising the steps of: periodically polling a dial-control management information base for dial peer traffic statistics; storing the polled data; estimating the carried traffic using the polled data; estimating the grade of service by utilizing the Erlang-B formula in an inverse manner, operating on the estimated carried traffic obtained in the first estimating step; and estimating the offered traffic using the estimated values for the carried traffic and the grade of service obtained in the previous estimation steps, where the dial-control management information base is standardized as per RFC 2128, and where the dial peer traffic statistics obtained in the polling step comprise at least dialCtlPeerConnectTime and dialCtlPeerStatsSuccessCalls as defined in said standard, and where the carried traffic is estimated using the following equation: where, for each dial peer i, CT(i,b) is the value of dialCtlPeerConnectTime for dial peer i at time b, CT(i,a) is the value of dialCtLPeerConnectTime for dial peer i at time a, and δ(i)=1 if dial-peer i is a dial-peer on the public switched telephone network side of the gateway, δ(i)=0 if the dial-peer is on the internet protocol side of the gateway, and C is the summation over all dial peers, giving the total carried traffic for the gateway.