Cisco IP Phone 6851 User Manual

Configure the SIP Settings for Extensions
Procedure
Step 1
In the phone web user interface, navigate to Admin Login > advanced > Voice > Ext(n), where n is an
extension number.
Step 2
In the SIP Settings section, set the parameter values as described in SIP Settings, on page 195.
Step 3
Click Submit All Changes.
Configure the SIP Proxy Server
Procedure
Step 1
In the phone web user interface, navigate to Admin Login > advanced > 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 199.
Step 3
Click Submit All Changes.
Configure the Subscriber Information Parameters
Procedure
Step 1
In the phone web user interface, navigate to Admin Login > advanced > 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 202.
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:
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
44
SIP and NAT Configuration

Cisco IP Phone 6851 Specifications

General

Brand	Cisco
Model	IP Phone 6851
Category	IP Phone
Language	English