Title	Improving the QoS of VoIP over WiMAX Networks Using OPNET Modeler
Author	Bassam M. AL-Mahadeen and Ameen Al-Mseden
Citation	Vol. 17  No. 8  pp. 132-142
Keywords	BE, ertPS, nrtPS, QoS, rtPS, UGS, WiMAX, VoIP Codecs.

Title	Effective Model for Achieving a High Efficiency Level in WiMAX: Karak Case Study
Author	Bassam M. AL-Mahadeen, Aya Sarairah
Citation	Vol. 17  No. 9  pp. 180-187
Keywords	WiMAX, OPNET, throughput, delay, load, HTTP, VoIP