Bill Douskalis. (2002). Putting voIP to work: Softswitch network design and testing. Upper Saddle River, NJ: Prentice-Hall PTR.
Trích dẫn kiểu ChicagoBill Douskalis. Putting VoIP to Work: Softswitch Network Design and Testing. Upper Saddle River, NJ: Prentice-Hall PTR, 2002.
Deismireacht MLABill Douskalis. Putting VoIP to Work: Softswitch Network Design and Testing. Upper Saddle River, NJ: Prentice-Hall PTR, 2002.
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