thanks for the reply..
yes we too know such setup but the problem is telecom regulation over here at Madagascar.
we use Arelnet Gateways. but some channel banks with DDI function or option exists in the market. what does it mean..would it not suitable for such or my applications. right now we have PBX connected to Gateway: so all the calls from this GW routed to this PBX: now we need more E&M trunks : so that is y i thought whether we can make use of channel bank instaed of PBX:
pls comment on this