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![Cover for Pramode K. Verma · Voice over IP Networks: Quality of Service, Pricing and Security - Lecture Notes in Electrical Engineering (Paperback Book) [2011 edition] (2013)](https://imusic.b-cdn.net/images/item/original/843/9783642266843.jpg?pramode-k-verma-2013-voice-over-ip-networks-quality-of-service-pricing-and-security-lecture-notes-in-electrical-engineering-paperback-book&class=scaled&v=1408487442)
![Cover for Pramode K. Verma · Voice over IP Networks: Quality of Service, Pricing and Security - Lecture Notes in Electrical Engineering (Hardcover Book) [2011 edition] (2011)](https://imusic.b-cdn.net/images/item/original/298/9783642143298.jpg?pramode-k-verma-2011-voice-over-ip-networks-quality-of-service-pricing-and-security-lecture-notes-in-electrical-engineering-hardcover-book&class=scaled&v=1408477584)