How many SIP channels does my business need?

A SIP channel carries one concurrent call. The question is not how many employees you have, but how many of them are on the phone at the same time.

A good starting rule for office environments is one channel for every three to four users. Call centers often need a ratio closer to one-to-one.

Look at your peak-hour call logs from your current provider. Add 20% headroom for growth and seasonal spikes, and choose an elastic plan that can burst when needed.