Assuming IP auth, pjsip trunk.
General: Fill in Trunk Name and Outbound CallerID.
Dialed Number Manipulation Rules: Outbound Dial Prefix: 12345678* (replace 12345678 with the tech prefix for your account). Leave other fields blank. This assumes that you are dialing numbers starting with the country code, or that your Outbound Routes rewrite numbers to that format.
pjsip Settings:
Authentication: None
Registration: None
SIP Server: us-west-or.sip.flowroute.com (replace with server for your account)
Match (Permit): 147.75.60.160/28,34.210.91.112/28,147.75.65.192/28,34.226.36.32/28
(I currently don’t have any DIDs with Flowroute so the inbound info may not be up to date. Check on their support site.
In case I missed something, also see
If you still have trouble, post what goes wrong, along with a log of a failing call.