Cisco 8851, Administration Manual

Page: 76 / 310

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 263 .
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.
Procedure
Step 1 On the Configuration Utility page, select
Admin Login
>
advanced
>
Voice
>
Ext(n)
.
Step 2 Set up the fields as described in NAT Settings, on page 255 .
Step 3 Click
Submit All Changes
.
NAT Mapping with Session Border Controller
We recommend that you choose an service provider that supports NAT mapping through a Session Border
Controller. With NAT mapping provided by the service provider, you have more choices in selecting a router.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
60
SIP and NAT Configuration