Issue with BYO SIP Trunk Provider

I tried calling after registering my own trunk provider from the dashboard. Receiving inbound calls works fine but outbound calls keep having this error. It does not come with anything else so it's hard to understand what really happen.
An error occurred in this call: call.in-progress.error-providerfault-outbound-sip-480-temporarily-unavailable

call id : a2f0c91d-c5cc-4fd9-9b96-d49b09cfaeaf

Any help would be greatly appreciated.
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