Cisco 8961 Administration Manual page 166

Telephony features available for Cisco Unified IP Phone
Feature
Configurable DF Bit
Configurable Font Size
Configurable RTP/sRTP Port
Range
Configurable TLS Session
Resumption Timer
CTI Applications
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
142
REVIEW DRAFT - CISCO CONFIDENTIAL
Description
Controls how network packets are sent. Packets can be
sent in chunks (fragments) of various sizes. When the
DF bit is set to 1 in the packet header, the network
payload does not fragment when going through network
devices, such as switches and routers. Removing
fragmenting avoids incorrect parsing on the receiving
side, but results in slightly slower speeds. By default,
the DF bit is set to 0.
The bit is set in the following screens:
• System > Enterprise Phone
• Device > Device Settings > Common Phone
Profile
• Device > Phone
The DF bit setting does not apply to ICMP, VPN, VXC
VPN, or DHCP traffic.
Allows users to increase or decrease the maximum
number of characters the IP phone displays for Call
History and Call Screen by changing the font size.
A smaller font increases the maximum number of
displayed characters, and a larger font decreases the
maximum number of displayed characters.
Provides a configurable port range (2048 to 65535) for
Real-Time Transport Protocol (RTP) and secure
Real-Time Transport Protocol (sRTP).
The default RTP and sRTP port range is 16384 to
32764.
You configure the RTP and sRTP port range in the SIP
Profile.
Enables resumption of TLS handshake without repeating
the authentication or confidentiality or authorization
process.
The TLS resumption timer range is between 0 to 3600
sec and the default timer value is 3600 sec.
A computer telephony integration (CTI) route point can
designate a virtual device to receive multiple,
simultaneous calls for application-controlled redirection.
Features, Templates, Services, and User Setup
Configuration Reference
For more information, see the Cisco
Unified Communications Manager
documentation.
No configuration required.
For more information, see Set up
RTP/sRTP port range, on page 200
For more information, see TLS Session
Resumption Timer, on page
For more information, see "CTI Route
Point Configuration" chapter in the Cisco
Unified Communications Manager
Administration Guide.
201.