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If a inbound route isn't setup correctly, you will hear a recording saying there is no service. To verify the routes go to Connectivity → Inbound Routes and ensure a inbound route has been made for the DIDs you have purchased. As well ensure the destinations have been set correctly. The complete guide for inbound routes can be found at Inbound Route User Guide.
Note, by default routes will be setup to play a DID verification. As a simple test change the destination to a configured extension. Below is an example of this.
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