Patent ID: 8346947

Claim:
A Data-Over-Cable Service Interface Specification (DOCSIS) cable modem system coupled to: via a local area internet protocol (IP) network, a voice over internet protocol (VoIP) device operating Session Initiation Protocol (SIP) for signaling a VoIP media session; and via a DOCSIS network, a cable modem termination system (CMTS) via a network; the cable modem system comprising instructions stored in a memory and executed by a processor, the instructions comprising: in response to receiving a frame via the local area IP network, the frame being a Session Initiation Protocol (SIP) message which includes identification of a compression protocol to be used for compressing digital audio of a real time protocol (RTP) stream of a VoIP session between the VoIP device and a remote endpoint: using the identified compression protocol to determine required service flow attributes, the required service flow attributes including a grant size and grant interval necessary for supporting the RTP stream; determining if the required service flow attributes match service flow attributes of an existing unsolicited grant (UGS) of a VoIP media session service flow between the cable modem and the CMTS; in response to both: i) determining that the required service attributes match service flow attributes of an existing UGS service flow between the cable modem and the CMTS; and ii) receiving a frame via the local area IP network, the frame being a SIP OK message to initiate the real time protocol stream of the VoIP session between the VoIP device and the remote endpoint; generating a DOCSIS Dynamic Service Change (DSC) request to add an additional sub flow to the existing UGS service flow to support the RTP stream of the VoIP session between the VoIP device and the remote endpoint; and in response to: i) determining that the required service attributes are different from service flow attributes of all existing UGS service flows between the cable modem and the CMTS; and ii) receiving a frame via the local area IP network, the frame being a SIP OK message to initiate the real time protocol stream of the VoIP session between the VoIP device and the remote endpoint; generating a DOCSIS Dynamic Service Change (DSC) request to initiate an additional UGS service flow with the required service flow attributes to support the RTP stream of the VoIP session between the VoIP device and the remote endpoint.