What about
EasyPABX?
(edit: when I posted this, I had not actually tried. But now I did and it really works, although sometimes my password was appearently not saved)
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In this scenario NO ONE have an hardware ATA.
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In this scenario no broadband internet, website portals or ATA would be involved:
In EasyPABX you configure two DDIs, one of which is a local DID (or a Voxalot account) used for incoming calls, pointing to a DISA extension in which you get a second dial tone after entering a PIN number. Your call is then routed to a LCR which uses the other DDI which is your outbound provider (Voipbuster, Wengo...).
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1- Can a Person A call a local Access Number in his country A (for exemple an acces number in Canada-Quebec city)
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If your inbound DDI is your Voxalot number, then it should be callable via SIP Broker. Otherwise you can get your own DID.
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3- ENTER USERNAME/PASSWORD of a VOIP provider (for example Wengo, VoipStunt) AND the PSTN phone number of the person B
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I guess you cannot do that, but you can set your own password and easypabx will keep your provider settings.
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DISA is a function that will give the caller a new dial tone and allow them to dial a new number.
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