Hi FranckCo,
Is your voice policy global?
Is your voice policy associated with the PSTN Usage?
If the Route associated with the same PSTN USAGE as the LOCATION POLICY, it should work as your understanding.
After creating a tagged Location Policy, you need to apply the policy to a user policy like the following command:
(Get-CsUser | where { $_.Name -match "UserName" }) | Grant-CsLocationPolicy -PolicyName Redmond
For more details, please refer to this document:
https://docs.microsoft.com/en-us/skypeforbusiness/deploy/deploy-enterprise-voice/create-location-policies.
As a supplement, you can read this blog to learn more about voice routing process:
http://www.gecko-studio.co.uk/lync-voice-routing-process/?LMCL=cdCbzv&LMCL=P8d_1b.
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Best Regards,
Sharon Zhao
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