Aplication for VOIP to Chile

I need a softphone application similar to Zoiper or Bria that registers on the server through QR, the server will enable a DID or numbering to the application valid for Chile to make and receive calls in Chile using the internet, the codec must be G711A / G711U
Who can make this app using part of the code and make a front for us that includes reading a QR for registration to our server.