But back to the main point of your question, yes, you should be able to find many providers who will offer you quite a few simultaneous outbound or inbound channels. There are too many to list so I'll just point you to VoIP-Info:
Is there any way to have a SIP Trunk. I mean to have for example 32 channels merged in one? or something like this? When i try to find SIP trunk on internet i just see options for TDM gateway or similar but not really a multiplexed trunk.Can we do something with freeswitch?