Voice Conversation Delays While Roaming
Problem
User complains of delays in the voice conversation while roaming.
Solution
•
Use the Site Survey Utility to see if there is another acceptable access point as a roaming option. The
next access point should have an signal of -67 dBm to roam successfully.
•
Check the Cisco Catalyst 45xx switch. If Cisco Catalyst 45xx series switches are being used as the main
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.
Phone Loses Cisco Unified Communications Manager Connection While
Roaming
Problem
User complains that the call gets dropped while roaming.
Solution
Check for the following configuration or connectivity issues between the phone and the access point:
•
The RF signal strength might be weak. Use the Site Survey Tool and check the RSSI value for the next
access point.
•
The next access point might not have connectivity to Cisco Unified Communications Manager.
•
There might be an authentication type mismatch between the phone and the next access point.
•
The access point might be in a different subnet from the previous access point. The Cisco Unified
Wireless IP Phone is capable of Layer 2 roaming only. Layer 3 roaming requires WLSM that uses GRE.
For more information, see
WLANs and Roaming, on page 30
.
•
If using EAP-FAST, LEAP, or Auto (AKM) authentication, the access point might be using filters to
block TCP ports. The RADIUS server uses port 1812 for authentication and 1813 for accounting.
Phone Does not Roam Back to Preferred Band
Problem
The phone does not roam back to the preferred wireless band.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
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Troubleshooting
Voice Conversation Delays While Roaming
