Inbound calls only work after placing an outbound call first

One of our SIP providers is a low traffic backup that’s rarely used. We got reports from users that inbound calls to DIDs on that alternate ITSP were failing. I did a few test calls to those DIDs and they all returned fast-busy and nothing showing up in our logs. I then placed an outbound call on that same ITSP trunk and that went through fine. Afterwards calls to those same DIDs were now passing normally.
Before I reach out to the provider, could there be something I’m missing on my end?
The only two settings I have setup under Connectivity > Trunks > “ITSP” > sip Settings > Outgoing> PEER Details is

Incoming is empty
There is no firewall between our system and the ITSPs router.

Try adding:

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