Sorry for the lack of research on this but someone may know off the top of their head

[Craig White]

what type of bandwidth should be assumed for a single VOIP connection?
Is it reasonable to consider a 128K Frame Relay for 2 voice, 1 fax and a
network data stream (I'm thinking that remote network clients can
function on relatively small bandwidths using thin client)

-- 
Craig White <craig at tobyhouse.com>