Cisco 6851 Administration Guide

• alternative outbound proxy server
• IN-Dialog message from proxy server and non-proxy server. For example: Call Session dialog and
Subscribe dialog
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 92.
Procedure
Step 1 Select Voice > System.
Step 2 In the System Configuration section, set the Block Nonproxy SIP field as described in the System
Configuration, on page 222.
Step 3 Click Submit All Changes.
Configure a Privacy Header
A user privacy header in the SIP message sets user privacy needs from the trusted network.
You can set the user privacy header value for each line extension using the phone web page.
The privacy header options are:
• Disabled (default)
• none—The user requests that a privacy service applies no privacy functions to this SIP message.
• header—The user needs a privacy service to obscure headers which cannot be purged of identifying
information.
• session—The user requests that a privacy service provide anonymity for the sessions.
• user—The user requests a privacy level only by intermediaries.
• id—The user requests that the system substitute an id that doesn't reveal the IP address or host name.
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 92.
Procedure
Step 1 Select Voice > Extension.
Step 2 In the SIP Settings section, set the Privacy Header field as described in the SIP Settings, on page 277.
Step 3 Click Submit All Changes.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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Phone Administration
Configure a Privacy Header

Cisco 6851 Specifications

General

Network Protocols	SIP
Speakerphone	Yes
Bluetooth	No
Wi-Fi	No
USB Port	No
Display	3.5 inch grayscale display (396 x 162 pixels)
Ethernet	10/100 Ethernet
PoE	IEEE 802.3af
Audio	Wideband audio
Line Keys	4
Headset Port	RJ9
Supported Codecs	G.711, G.722, G.729, iLBC
Weight	0.9 kg