Cisco 8821 Administration Guide

Phone Cannot Connect to TFTP Server or to Cisco Unified Communications Manager
116
Phone Cannot Connect to TFTP Server 116
Phone Cannot Connect to Server 117
Phone Cannot Connect with DNS 117
Cisco Unified Communications Manager and TFTP Services Are Not Running 118
Phone is Not Configured in Cisco Unified Communications Manager 118
Configuration File Corruption 118
Phone Reset Problems 118
Phone Resets Due to Access Point Setup 119
Phone Resets Due to Intermittent Network Outages 119
Phone Resets Due to DHCP Setting Errors 119
Phone Resets Due to Incorrect Static IP Address 119
Phone Resets During Heavy Network Usage 120
Phone Resets Due to Intentional Reset 120
Phone Resets Due to DNS or Other Connectivity Issues 120
Audio Problems 120
One-Way Audio or No Speech Path 121
Ring Volume is Too Low 121
Phone Does Not Ring 122
Feature Issues 122
Users Report Problems with Call Park 122
Roaming and Voice Quality or Lost Connection Problems 123
Voice Quality Deteriorates While Roaming 123
Voice Conversation Delays While Roaming 123
Phone Loses Cisco Unified Communications Manager Connection While Roaming 124
Phone Does not Roam Back to Preferred Band 124
Troubleshooting Procedures 124
Check TFTP Settings 125
Determine DNS or Connectivity Issues 125
Check DHCP Settings 126
Create New Phone Configuration File 126
Start Service 127
Capture Phone Logs 127
Make a Screen Capture 128
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
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Contents

Cisco 8821 Specifications

General

Wi-Fi	Yes
Ethernet LAN	No
Wi-Fi standards	802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version	3.0+HS
Security algorithms	EAP-FAST, EAP-TLS, PEAP, WPA
Networking standards	IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11d, IEEE 802.11e, IEEE 802.11g, IEEE 802.11n, IEEE 802.11r
USB 2.0 ports quantity	1
Voice codecs	G.711, G.711a, G.722, G.729, G.729ab, iLBC
Volume control	Digital
Product type	IP mobile phone
Product color	Black
Input frequency	50 - 60 Hz
AC adapter input voltage	100 - 240 V
AC adapter output current	0.2 A
Display diagonal	2.4 \
Display resolution	240 x 320 pixels
Frequency band	2.412, 2.472, 5.180, 5.240, 5.260, 5.320, 5.500, 5.700, 5.745, 5.825 GHz
Lines quantity	- lines
Phonebook capacity	- entries
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Safety	UL 60950-1, CAN/CSA 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950.1, IEC 60529 (IP 67)
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 B ● EN 55024 ● EN 50082-1 ● EN 61000-6-1 ● EN61000-6-3 ● EN 300386 ● EN 60601-1-2 ● KN
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	17 mm
Width	56 mm
Height	132 mm
Weight	126 g