Roaming And Voice Quality Or Lost Connection Problems; Voice Quality Deteriorates While Roaming; Voice Conversation Delays While Roaming - Cisco 8821 Administration Manual

Troubleshooting

Roaming and Voice Quality or Lost Connection Problems

If users report that when they are engaged in an active phone call and walking from one location to another
(roaming), the voice quality deteriorates or the connection is lost, use the information in this section to identify
the cause of the problem.
Related Topics
Audio Problems, on page 120

Voice Quality Deteriorates While Roaming

Problem
User complains that the voice quality deteriorates while roaming.
Solution
• Check the RSSI on the destination access point to see if the signal strength is adequate. The next access
• Check the site survey to determine if the channel overlap is adequate for the phone and the access point
• Check to see if noise or interference in the coverage area is too great.
• Check that signal to noise ratio (SNR) levels are 25 dB or higher for acceptable voice quality.

Voice Conversation Delays While Roaming

Problem
User complains of delays in the voice conversation while roaming.
Solution
• Check the Neighbor List to see if there is another acceptable access point as a roaming option. The next
• Check the Cisco Catalyst 45xx switch. If Cisco Catalyst 45xx series switches are being used as the main
point should have an RSSI value of -67 dBm or greater.
to hand off the call to the next access point before the signal is lost from the previous access point.
access point should have an signal of -67 dBm to roam successfully.
Layer 3 switches in the network, ensure that the supervisor blades are a minimum SUP2+ or later version.
The wireless phone (or any wireless client) experiences roaming delays when an earlier version (SUP
1 or SUP2) blade is used.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager

Roaming and Voice Quality or Lost Connection Problems

123