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Cisco 6821 Administration Guide

Cisco 6821
358 pages
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Configure the SIP Proxy Server
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 92.
Procedure
Step 1 Select Voice > Ext(n), where n is an extension number.
Step 2 In the Proxy and Registration section, set the parameter values as described in Proxy and Registration, on
page 283.
Step 3 Click Submit All Changes.
Configure the Subscriber Information Parameters
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 92.
Procedure
Step 1 Select Voice > Ext(n), where n is an extension number.
Step 2 In the Subscriber Information section, set the parameter values as described in Subscriber Information, on
page 286.
Step 3 Click Submit All Changes.
Managing NAT Transversal with Phones
Network Address Translation (NAT) allows multiple devices to share a single, public, routable, IP address
to establish connections over the Internet. NAT is present in many broadband access devices to translate public
and private IP addresses. For VoIP to coexist with NAT, NAT traversal is required.
Not all service providers provide NAT traversal. If your service provider does not provide NAT traversal,
you have several options:
• NAT Mapping with Session Border Controller
• NAT Mapping with SIP-ALG Router
• NAT Mapping with a Static IP Address
• NAT Mapping with STUN
Enable NAT Mapping
You must enable NAT mapping to set NAT parameters.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
71
Phone Installation
Configure the SIP Proxy Server

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Cisco 6821 Specifications

General IconGeneral
Resolution320 x 240 pixels
SpeakerphoneYes
Headset PortYes
ProtocolsSIP
USB PortNo
WirelessNo
BluetoothNo
Video SupportNo
Conference CapabilitiesYes
Wall MountableYes
Display3.5-inch grayscale
Ethernet10/100 Ethernet
Line Keys2
PoEIEEE 802.3af Power over Ethernet (PoE)
CodecsG.711, G.722, G.729, iLBC
Weight2.0 lb (0.91 kg)

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