Apparently it may be a dial plan problem on your Voxalot configuration. Check it!
See if your VSP is registered or not: some providers require that you register before you can dial out through them.
Usually, the message you refer is generated by Voxalot whet it can't find any dial rule to dial out. Without any dial plan configured, Voxalot resolves dialed numbers through SIP Broker, ENUM or iNum if the dialed number matches any one of this hypothesis. So, check the dial plan configuration at Voxalot on the Dial Plan Test feature with the non working phone numbers.
Regards,
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