| [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] bandwidth improving 2nd bandwidth consumption of codecs bandwidth modeling performing 2nd 3rd best practices for QoS 2nd best security practices securing central facilities 2nd 3rd 4th 5th 6th 7th best-practice fault management billing 2nd building pilot VoIP deployment 2nd 3rd evaluating systems 2nd 3rd solving echo problems 2nd transcoding bursts busy hour |