Froehlich, Andrew G.
CVOICE 8.0 implementing Cisco Unified Communications Voice over IP and QoS v8.0 : study guide
Indianapolis Wiley Pub, 2011
 Multimedia
Voice over IP: systems and solutions
edited by Richard Swale
Institution of Engineering and Technology, 2008
 eBooks
Layanan Intelligent Network (IN) untuk voice over ip (VOIP)
Fakultas Teknik Universitas Indonesia, 1999
 UI - Skripsi (Membership)
Davidson, Jonathan
Voice over IP fundamentals / Jonathan Davidson, James Peter
Cisco Press , 2000
 Buku Teks
Hendy J. Agusta
Teknologi voice over IP: Masa depan telepon jarak jauh
Fakultas Ilmu Komputer Universitas Indonesia, 2000
 UI - Tesis (Membership)