Cisco 7912G - Manual (Page 81)

4-7
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
OL-8131-01
Chapter 4 Configuring Settings on the Cisco Unified IP Phone
Configuring IP Settings
Configuring IP Settings
Use these guidelines when manually configuring the IP settings:
• You can use 0.0.0.0 for the subnet mask only if the default gateway is also
0.0.0.0.
• Ensure the TFTP server has an IP address.
• Ensure the default gateway IP address is on the same subnet as the host IP
address.
Note Procedures involved in configuring IP settings or TFTP parameters cannot be
completed when DHCP is enabled in your network.
Configuring the Encryption Key
Cisco Unified Call Manager can operate in secure or non-secure mode. When
operating in secure mode, Cisco Unified Call Manager generates encrypted
configuration files that can be decrypted only with the same encryption key.
If you are operating your phone in a secure environment, you must manually
configure the encryption key that the phone will use to decrypt the configuration
file downloaded from Cisco Unified Call Manager. You may configure the
encryption key by using either the LCD screen on the phone or by using the Phone
Configuration Web page.
The instructions in the following encryption-related sections assume a network
environment in which a DHCP server provides the applicable TFTP IP address,
and the Cisco Unified IP Phone has been pre-configured on the
Cisco Unified CallManager to run SIP.
This section contains the following topics:
• Configuring Encryption Key Using LCD screen on the Phone, page 4-8
• Configuring Encryption Key Using Phone Configuration Web Page, page 4-9