Cisco 8841 Administration Guide

Step 2 In the Proxy and Registration section, set the parameter values as described in Proxy and Registration, on
page 327.
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 88.
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 329.
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.
Before you begin
Access the phone administration web page. See Access the Phone Web Page, on page 88.
Procedure
Step 1 Select Voice > Ext(n).
Step 2 Set up the fields as described in NAT Settings, on page 320.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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Cisco IP Phone Installation
Configure the Subscriber Information Parameters

Cisco 8841 Specifications

General

Brand	Cisco
Model	8841
Category	IP Phone
Language	English