1.
Cisco QOS Exam Certification Guide (IP Telephony Self-Study) (2nd Edition)
by Wendell Odom, Michael J. Ca...
ISBN: 9781587201240
List Price: $76.99
2.
Ccna Voice Official Exam Certification Guide (640-460 Iiuc)
by Cioara, Jeremy, Cavanaugh, ...
ISBN: 9781587058318