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VoIP/VoMPLS Control Plane call control establishes, modifies, and releases telephone calls e.g., SIP or H.323 in distributed VoIP architecture, Call Agents control gateways using MGCP or MEGACO/H.248 arranges for media gateway to obtain address of terminating GW determines, through negotiation if necessary, what processing functions the media GW must apply to the media stream e.g., codec choice, echo cancellation, etc. connection/bearer control establishes, modifies, & releases logical connections between gateways provide fairness in sharing of LSPs TE provides low-delay, low jitter routes for VoIP QoS guarantees for existing connections should be unaffected by new voice calls new calls should be rejected at network edge if insufficient resources are available network should be resilient to mass calling events |