Each T-1 has 24 channels available. The real question is, how many DID numbers can be supported on a Trunk (channel)?

Like all trafficking questions, the answer is affected by two main points- how busy is the site (how many calls and of what duration) and how many trunks are allocated.

The more trunks you allocate, the more numbers you can support.

100 numbers can easily be supported on 10-15 trunks, but 5000 numbers can easily be supported on 150-200 trunks! though to be honest, part of this formula is because as an organization gets larger (5000 people in one location) more and more of it's calls become internal.

Your carrier should be able to give you trafficking information, including Busy-Hour statistics that will help you decide on how many channels you need.

Sam

"Where are we going and why are we in this hand basket?"