In this paper, the performance of WiMAX for Voice over IP (VoIP) by applying different mobility patterns is analyzed for Good sectors and bad sectors. The performance is analyzed by using OPNET Modelller. The performance is compared in terms of delay, traffic received and packet end-to-end delay. The results show that the performance of G.711 is better than other codes. The result also shows that the performance of Random walk is better in most of the cases. The result also shows that with increase in packet voice per frame the Delay, Traffic received and Packet end to end delay decrease.