The existing approach, that is Endpoint Based Call Admission Control for VoWLAN is used to carry the VoIP and other traditional data traffic over the WLAN. Even if lot of research work is conducted in this field, but still there are certain limitations, issues and flaws in the existing approach due to which it could not provide acceptable Quality of Service. This book emphasizes on these issues and flaws, along with the new methodology using retransmission timer, which reduced various limitations and issues, and according to the results obtained after implementation, it offered acceptable Quality of Service.