Un procedimiento, dispositivos y sistema para controlar la provisión de servicios de voz en redes de comunicaciones móviles

A system, method and devices for controlling provision of a voice service at a terminal of a first mobile communications network based on the expected quality of service. The presented embodiments improve the VolP service performance in mobile telecommunication networks solving the problems of current VolP services, providing to the user a good quality, especially in low coverage or congestion scenarios (reaching a similar quality than the CS voice calls in the same situations).