It is a call which is made over internet protocol (VoIP). For example,
one can call using Google Voice to other recipient located miles away. Such
call can also be international.
GMT es un operador de telefonia fija y movil virtual, con licencia para operar, tenemos rutas directas a europa y los principales paises de latino/america, estamos interesados en negocios bilaterales, con carriers de todo el mundo.