Cablevision Systems announced the expansion of its Optimum Voice Session Initiation Protocol (SIP) Trunking from Optimum Business. The enhanced offering is intended to deliver voice service to small businesses through a converged voice and data network that can scale as needed for up to 100 employees. The service is designed for customers that want to take full advantage of a small business IP PBX system, while avoiding the cost of an analog gateway and traditional T-1 solutions.Features include capacity for 100 direct inward dial (DID) telephone numbers, immediate alternate call routing, capability for dynamic service upgrades, caller ID, white pages listing, E911, call forwarding, anonymous call blocking and anonymous calling.