We need a custom SIP/WebRTC client which can make inbound and outbound calls with the numbers encrypted. On receiving an inbound call, it calls an external API (SFDC) to find out if the number is registered and depending on whether it is registered, a URL scheme is invoked to open a specific page.
The custom app also needs to call wrap up functionality to take call notes.
For outbound call, the SFDC calls the localhost of the mobile app with the number and the app calls the sip server for the call
The mobile app connects to the SIP server through a VPN
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