asterisk users - May 2006 - Bandwidth via my Asterisk PBX

Am new to Asterisk - have it up and running & connected to a couple service
providers (telasip & teliax).  Nice!

Am running our Asterisk PBX on a static DSL connection (~600 kbps up/~4mbps
down), and would like to extend VoIP service to 10 non-profits we're working
with.  Am I correct in assuming that all calls from each organization would
route through our Asterisk server & be passed off to the service provider (
i.e. TelaSip, Teliax) thus keeping our bandwidth requirements to a minimum?
Or - are ALL calls that route through our Asterisk PBX consuming our
bandwidth through the duration of the call?

Thanks,
Dakota
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> Am I correct in assuming that all calls from each organization would
> route through our Asterisk server & be passed off to the service
provider
That depends on your setup, on the provider and on the organization.
If all support ReInvites and have them enabled, then it will work and
the RTP traffic will flow between the organization and the provider.
But each organization needs to be reachable via a public IP (i.e. not
NAT) and the provider you use must support it too. I believe most(?)
do, but you should check.

--Luki