Cisco 7925G Administration Guide

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

Cisco 7925G Specifications

General

Keypad number of keys	12
Display diagonal	2 \
Display resolution	176 x 220 pixels
Call waiting	Yes
Lines quantity	6 lines
Voice codecs	G.711a, G.722, G.729a, iLBC
Security algorithms	128-bit WEP, SSL/TLS, WPA
Supported network protocols	DHCP, TFTP, DNS, SCCP, SRST
Input voltage	100 - 240 V
Dimensions (WxDxH)	52 x 20 x 127 mm
Minimum system requirements	Cisco Unified Communications Manager 4.1, 4.2, 4.3, 5.1, 6.0, 6.1, 7.0 + Cisco Unified Communications Manager Express 4.3 +
Input frequency	50/60 Hz
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Product type	IP Phone
Product color	Gray
Safety	UL 60950, CSA 22.2 No.60950, EN 60950, IEC 60950, AS/NZS 60950, IEC 60529 (IP 54)
Certification	47 CFR 15 B ICES-003 B EN 55022 B AS/NZS CISPR 22 B CISPR 22 B VCCI B EN 61000-3-2 EN 61000-3-3 KN 22 EN 55024 EN 50082-1 EN 61000-6-1 EN 300386 EN 60601-1-2 KN
Compliance industry standards	IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.1X, IEEE 802.11e

Weight and Dimensions

Weight	138 g