Question about the PBX setup...

If I understand correctly, genxweb mentions creating multiple trunks in order to enable multiple simultaneous calls.

Is that necessary, or even possible, in freepbx? It seems like creating a single, multichannel trunk accomplishes the same thing.

I ask because I've recently had a lot of problems with "all circuits are busy" messages with several customers, all starting last week.

I'm wondering if I should try creating multiple trunks with the same account, rather than one multiple channel trunk.