I don't find Ron's explanation to contain any errors. If you are encountering problems with your ATA giving you a fast busy signal after correctly creating a Voxalot dial plan that routes calls by different providers, it means you have not changed your Sipura/Linksys dial plan to allow for the number patterns you are sending to Voxalot. Your dial plan in your ATA itself must also allow for sending unusual combinations like #212125555 out (the normal generic plan many places suggest will not allow such a number combination).
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