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A Trunk is your carrier connection - the SIP capacity phone numbers ride on. Numbers come from trunks: after you register one, client.numbers.sync() discovers its numbers so you can attach them to a Speech Pipe. You bring your own carrier (Twilio, Tata, …) and register it once with its SIP credentials. After that you work with numbers, not SIP.

Register a trunk

List and delete

Then sync your numbers

See Numbers for attaching them, or follow Make Your First Phone Call for the full provisioning walk-through.