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Classically, social institutions are provided with a PABX-based unified and shared telephony service. With the mobile communications development, the organization of the telephony service is disrupted in favor of individual use. Mobile terminals capacities and usage development increase this trend. These terminals are more convenient in a social context which requires the ability to communicate anytime and anywhere. One non negligible perverse effect of this individual use of telephony service is the use of workers’ private resources for their work. To face this practice, we analyzed Voice over Internet Protocol opportunity for low-budget institutions, designed a low-cost solution which offers a unified and shared access to GSM networks and made propositions about quality of service and security challenges.