Field: Always Use Prime Line; Disable Transport Layer Security Ciphers - Cisco 7800 Series Administration Manual

Field: Always Use Prime Line

Field
Show All Calls on Primary Line
Revert to All Calls
Field: Always Use Prime Line
This field specifies whether the primary line on an IP phone is chosen when a user goes off-hook. If this
parameter is set to True, when a phone goes off-hook, the primary line is chosen and becomes the active line.
Even if a call rings on the second line of the user, when the phone goes off-hook, it makes only the first line
active. It does not answer the inbound call on the second line. In this case, the user must choose the second
line to answer the call. The default value is set to False.
The purpose of the Always Use Prime Line field is very similar to the combination of Show All Calls on the
Primary Line and Revert to All Calls when both of those two features are enabled. However, the main difference
is that when Always Use Prime Line is enabled, inbound calls are not answered on the second line. Only dial
tone is heard on the prime line. There are certain high call volume environments where this is the desired user
experience. In general, it is best to leave this field disabled except for high call volume environments that
require this feature.

Disable Transport Layer Security Ciphers

You can disable Transport Layer Security (TLS) ciphers with the Disable TLS Ciphers parameter. This
allows you to tailor your security for known vulnerabilities, and to align your network with your company's
policies for ciphers.
None is the default setting.
Disable more than one cipher suite by selecting and holding the Ctrl key on your computer keyboard. If you
select all of the phone ciphers, then phone TLS service is impacted. Your choices are:
• None
• TLS_RSA_WITH_3DES_EDE_CBC_SHA
• TLS_RSA_WITH_AES_128_CBC_SHA
• TLS_RSA_WITH_AES_256_CBC_SHA
• TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
• TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
• TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
For more information about phone security, see Cisco IP Phone 7800 and 8800 Series Security Overview
White Paper
white-paper-listing.html).
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
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Administration Area
Product Specific Configuration
Layout
Product Specific Configuration
Layout
(https://www.cisco.com/c/en/us/products/collaboration-endpoints/unified-ip-phone-8800-series/
Cisco IP Phone Administration
Recommended Setting
Enabled
Enabled