Используйте приложение APKPure
Историческую версию Insaf Network можно получить на Android
Insaf Network - это простое приложение для набора номера SIP, которое может легко делать VOIP-вызов
The main feature of this Applications are :
★ Making VoIP Calls to Support GSM number and other SIP clients.
★ Supports WiFi, 3G / 4G, edge or UMTS.
★ Clear voice quality with cheaper call rates
★ Talk with yours friends, partners, family anytime anywhere
★ Easy Sign Up with Mobile Number as user ID & automatic Buddy List creation with facility to invite phonebook contacts to install the app