If you find yourself still trying to get incoming calls working after several hours (like me), be advised that the default DID settings on voip.ms will not work. You merely have to set up a sub-account and make sure to set the authentication type as user/password authentication. Add your DID's to the sub-account and authenticate with the accountnumber_subaccount convention and use the password you created when setting up the sub-account.
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RE: Setting up a SIP trunk in FreePBX 13