Cisco 7800 Series Administration Manual page 58

SIP and NAT Configuration
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.
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.
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.
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
Cisco IP Phone 7800 Series for Third-Party Call Control Administration Guide
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