Patent ID: 7706299

Claim:
A voice-over-IP (VoIP) integrated router operable to interface with analog telephones and digital devices, wherein the VoIP-integrated router is configured to perform a method of estimating an upstream bandwidth of a modem, comprising: transmitting various-sized packets from the VoIP-integrated router through an upstream path for the modem to a node, the various sizes for the packets ranging from smaller packets to larger packets, the node being configured to re-transmit the various-sized packets through a downstream path for the modem to the VoIP-integrated router such that each packet makes a roundtrip through the modem; determining the roundtrip times for the various-sized packets; forming a ratio between a roundtrip time for the larger packets as compared to the round-trip time for the smaller packets; and estimating the upstream bandwidth of the modem using a power law function of the ratio.