Sumber:http://hari.narmadi.net/telekomunikasi/teknologi-jaringan-voiphttp://www.ristinet.com/index.php?ch=8&lang=&s=355b9a76e3238a7f85f9637f083b8f22&n=208
Sumber:
BalasHapushttp://hari.narmadi.net/telekomunikasi/teknologi-jaringan-voip
http://www.ristinet.com/index.php?ch=8&lang=&s=355b9a76e3238a7f85f9637f083b8f22&n=208