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Assumes you already have an agent — see the browser quickstart for creating one — and a number imported under Import Numbers in the dashboard.
1

Attach hangUp first

Without hangUp the agent cannot end a call. It finishes speaking and waits while the caller sits in silence. Do this before the number is live, not after the first complaint.
2

Tune the settings for a phone line

Why: callers expect a greeting; an uninterruptible first message means a recording notice is actually heard; ten minutes stops a stuck call burning credits; twenty seconds of silence gets a spoken check-in rather than a dead line.
3

Assign the number

Assignment is a PATCH on the number, setting its agentId:
Unassign with { "agentId": null }.
4

Call it

Listen for the things a browser test cannot show you: does the greeting still sound right at narrowband quality, is there a gap before it speaks, does it cope with background noise, does it hang up cleanly.

Telephony

Transfers, outbound, and what else changes on a phone call.