Determine Dns Or Connectivity Issues; General Troubleshooting Information - Cisco 7975G Software Manual

Troubleshooting and Maintenance
The Service Status symbol changes from a square to an arrow.

Determine DNS or Connectivity Issues

If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
Procedure
Step 1 Use the Erase softkey to reset phone settings to their default values. See
Restore, on page 234
Step 2
Modify DHCP and IP settings:
a) Disable DHCP. See
b) Assign static IP values to the phone. See
the same default router setting used for other functioning Cisco Unified IP Phones.
c) Assign TFTP server. See
server used for other functioning Cisco Unified IP Phones.
Step 3 On the Cisco Unified Communications Manager server, verify that the local host files have the correct
Cisco Unified Communications Manager server name mapped to the correct IP address.
Step 4 From Cisco Unified Communications Manager, choose System > Server and verify that the server is referred
to by the IP address and not by its DNS name.
Step 5 From Cisco Unified Communications Manager, choose Device > Phone and verify that you have assigned
the correct MAC address to this Cisco Unified IP Phone. For information about determining a MAC address,
see Cisco Unified IP Phone MAC Address Determination, on page
Step 6 Power cycle the phone.

General Troubleshooting Information

The following table provides general troubleshooting information for the Cisco Unified IP Phone.
Table 54: Cisco Unified IP Phone Troubleshooting
Summary
Daisy-chaining IP phones
Poor quality when calling
mobile phones using the G.729
protocol
for details.
Network Configuration Menu, on page 66
Network Configuration Menu, on page 66
Explanation
Cisco does not support connecting an IP phone to another IP phone through
the PC port. Each IP phone should directly connect to a switch port. If
phones are connected together in a line (by using the PC port), the phones
do not work.
In Cisco Unified Communications Manager, you can configure the network
to use the G.729 protocol (the default is G.711). When using G.729, calls
between an IP phone and a mobile phone will have poor voice quality. Use
G.729 only when absolutely necessary.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
General Troubleshooting Information
for instructions.
Network Configuration Menu, on page 66
for instructions. Use the same TFTP
41.
Communications Manager 9.0 (SCCP and SIP)
Cisco Unified IP Phone Reset or
for instructions. Use
231