Windiarto, Ardi, and Kholilatul Wardani. 2019. “Rancang Bangun Voice Over Internet Protocol Dan GSM Gateway Berbasis Raspberry Pi”. TELKA - Telekomunikasi, Elektronika, Komputasi Dan Kontrol 5 (1):55-64. https://doi.org/10.15575/telka.v5n1.55-64.