Please make sure that your VoIP provider is in DIDWW predefined list, if you cannot find your VoIP provider in the predefined list please send our support team the information requested in Add your VoIP Provider to the Predefined List.
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KB » PSTN (Land Line and Cellphone)
KB » PSTN (Land Line and Cellphone)

Can I use my WiFi mobile (trough my VoIP account) to use your DID number?