VOIP use about the same ammount of bandwith on bothe direcctions. For that reason you will need symetric bandwith, or you will limited by the upload speed. You never get to use the diference (unles you do some web surfing on the same link,not recomended).
Be carefull!!! Not every sat.internet provider is good for voip.Depending on the sampling rate, what is good for data could be unusable for VOIP.
30 channels of PSTN , using 12-15 kb of bandwith each. Depends a lot on type of equipment
A terminal like Quintum, with the packet saver option could save you big bucks on bandwith.
I’m using VocalTec & Cisco at the moment. I read a lot of recommendations of QUINTUM. Have u try it? Do you know any Carrier Exchange (like ITXC) that has use it?
Do you know how to connect different VoIP gateway products?
Yes, I have some Quintums, now working on geting some Cisco Call manager on line.
The Quintum is stable and very nice, as long as you stay away from the A200. That unit have some troubles and Quintum does not have control over the issues.
I only play with quintum so far. Now I am on the procces to integrate the Quintums with a Cisco call manager. Not much experience yet, but still works with Cisco Call manager on the first try.