| Subject | English | Bulgarian |
| comp., MS | Callback Control Protocol | протокол за управление на обратното повикване (The Network Control Protocol that negotiates the use of callback over PPP links) |
| comp., MS | callback function | функция за обратно повикване (A function provided by (IIS) that allows an Internet Server API (ISAPI) extension or filter to access IIS services) |
| comp., MS | callback security | защита за обратно повикване (A form of network security in which a remote access server calls a user back at a preset number after the user has made an initial connection and has been authenticated) |
| comp., MS | Emergency Callback Mode | Режим за спешни обратни повиквания (A mode the phone goes into after a user calls an emergency number (ex: 911) and the call ends. When the phone is in this mode, only the emergency operator can call the person on their phone, so that the emergency operator can call back or determine where the user is at. The phone is in this mode for about 5 minutes or until the user cancels out of the mode) |