Cisco 7920 Administration Guide - Page 46

Components of the VoIP Wireless Network Chapter 2 An Overview of the Wireless Network • Interacting with the Cisco Aironet Access Point, page 2-8 • Wireless Network and Access Point Configuration, page 2-19 Voice Quality in a Wireless Network Voice traffic on the Wireless LAN, like data traffic, is susceptible to delay, jitter, and packet loss. These issues do not impact the data end user, but have serious implications for a voice call. To ensure that voice traffic receives timely and reliable treatment with low delay and low jitter, you must use Quality of Service (QoS), and use separate virtual LANs (VLANs) for voice and data. By isolating the voice traffic onto a separate VLAN, you can use QoS to provide priority treatment for voice packets when traveling across the network. You need the following VLANs on the network switches and the access points that support voice connections on the WLAN. • Voice VLAN-Voice traffic to and from the wireless IP phone • Native VLAN-Data traffic to and from the wireless PC (native VLAN) Assign separate SSIDs to the voice and to the data VLANs. You can also configure a separate management VLAN in the WLAN, but do not associate an SSID with the management VLAN. By separating the phones onto a voice VLAN and marking voice packets with higher CoS, you can ensure that voice traffic gets priority treatment over data traffic.You can management traffic resulting in lower delay and fewer lost packets. For more information, refer to the Cisco Wireless IP Phone 7920 Design and Deployment Guide. Related Topics • Security Mechanisms in the Wireless Network, page 2-13 • Interacting with Cisco CallManager, page 2-17 • Wireless Network and Access Point Configuration, page 2-19 2-12 Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 4.0 and 4.1 OL-7104-01