Cisco 3905 Administration Guide

Phone Cannot Connect to TFTP Server or to Cisco Unified Communications
Manager 81
TFTP Server Settings 81
IP Addressing and Routing 81
Cisco CallManager and TFTP Services Are Not Running 81
Configuration File Corruption 82
Cisco Unified Communications Manager Phone Registration 82
Cisco Unified IP Phone Cannot Obtain IP Address 82
Cisco Unified IP Phone Resets Unexpectedly 83
Physical Connection Problems 83
Intermittent network outages 83
DHCP Settings Errors 83
Static IP Address Settings Errors 84
Voice VLAN Setup Errors 84
Phones Have Not Been Intentionally Reset 84
DNS or Other Connectivity Errors 84
Power Connection Problems 85
Audio Problems 85
No Speech Path 85
Choppy Speech 85
Poor Audio Quality with Calls That Route Outside Cisco Unified Communications
Manager 86
General Telephone Call Problems 86
Phone Call Cannot Be Established 86
Phone Does Not Recognize DTMF Digits or Digits Are Delayed 86
Troubleshooting Procedures 87
TFTP Settings 87
DHCP Setting Verification 87
Start Service 87
Create New Configuration File 88
Determine DNS or Connectivity Issues 89
General Troubleshooting Information 89
Additional Troubleshooting Information 91
Maintenance 91
Cisco Unified IP Phone Reset or Restore 92
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
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Contents

Cisco 3905 Specifications

General

Speakerphone	Yes
Ethernet Switch	No
Handset	Standard
Protocol Support	SIP
Lines	1
Headset Port	No
Power over Ethernet (PoE)	IEEE 802.3af Class 1
Ethernet Ports	2