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Configuring Your System for ITSP
Interoperability
Configuring NAT Mapping
Cisco Small Business WRP400 Administration Guide
This chapter provides configuration details to help you to ensure that your
infrastructure properly supports voice services.
•
"Configuring NAT Mapping," on page 21
•
"Firewalls and SIP," on page 26
•
"Configuring SIP Timer Values," on page 27
As discussed in
Chapter 1, "Product Overview and Deployment Guidelines,"
some form of NAT mapping is needed to support VoIP. If your ITSP does not
support NAT mapping through a Session Border Controller, and your edge device
is not a SIP-ALG router, you can address this issue through one of the following
methods:
•
"Configuring NAT Mapping with a Static IP Address," on page 21
•
"Configuring NAT Mapping with STUN," on page 23
Configuring NAT Mapping with a Static IP Address
This option can be used if the following requirements are met:
•
You must have a static external (public) IP address from your ISP.
•
The edge device—that is, the router between your local area network and your
ISP network—must have a symmetric NAT mechanism. If the WRP400 is the
edge device, this requirement is met. If another device is used as the edge
device, see
"Determining Whether the Router Uses Symmetric or
Asymmetric NAT," on page
25.
2
21
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