Cisco 8851 Guide

DescriptionParameter
IP address or name of the secondary NTP server used
to synchronize its time.
Perform one of the following:
• In the phone configuration file with
XML(cfg.xml), enter a string in this format:
<Secondary_NTP_Server ua="rw"/>
• In the phone web page, enter the IP address of
the secondary NTP server.
Default: Blank
Secondary NTP Server
Configure the RTP Parameters
Before you begin
Access the phone administration web page. See Access the Phone Web Interface, on page 104.
Procedure
Step 1 Select Voice > SIP.
Step 2 In the RTP Parameters section, set the Real-Time Transport Protocol (RTP) parameter values as described
in RTP Parameters, on page 355.
Step 3 Click Submit All Changes.
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
354
Cisco IP Phone Installation
Configure the RTP Parameters

Cisco 8851 Specifications

General

Resolution	800 x 480 pixels
Network Interfaces	Dual Gigabit Ethernet ports
Headset Port	Yes
Audio	Wideband audio
Ethernet	10/100/1000 Mbps
USB	Yes, USB 2.0
Power	IEEE 802.3af/at Power over Ethernet (PoE)
Protocols	SIP
PoE	Yes
Codec Support	G.711, G.722, G.729, iLBC
Headset Connector	RJ9
Lines	Up to 5 lines
Dimensions	229 x 256 x 41 mm (excluding foot stand)
Weight	1.2 kg