To make PSTN <-> PSTN calls using Web Callback, she would need a VoIP provider that supports two simultaneous outgoing calls or two individual VoIP providers.
Even though she would not be registering a SIP device directly with VoXaLot, she would need to signup and obtain a VoXaLot number.
To set up the VoXaLot Provider entry(s), she would need the normal SIP credentials you receive when you sign up for BYOD (Bring Your Own Device) service (i.e. Username, Password, Hostname, and Portnumber). No Dial Plans or Call Forwarding entries on VoXaLot would be required for Web Callback use.
Ron
P.S. She could call you via your BT100/VoXaLot number and her PSTN number and only incur one PSTN charge instead of two in the case of PSTN <-> PSTN calls.
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