Go to
this link to see a complete list of supported VoIP operators per country and the information about VoIP Trunk configuration:
Wildix supported VoIP operators2018-04-192018-05-28https://www.wildix.com/wp-content/uploads/2018/04/wildix-logo-2.pngWildixhttps://www.wildix.com/wp-content/uploads/2018/04/interoperability-portfolio.jpg200px200px