Windiarto, A. and Wardani, K. 2019. Rancang Bangun Voice Over Internet Protocol dan GSM Gateway Berbasis Raspberry Pi. TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol. 5, 1 (May 2019), 55–64. DOI:https://doi.org/10.15575/telka.v5n1.55-64.