Chapter 2 Configure Your System For Itsp Interoperability; Configure Nat Mapping; Configure Nat Mapping With A Static Ip Address - Cisco WRP500 Administration Manual

R E V I E W D R A F T # 1 — C I S C O C O N F I D E N T I A L
Configure Your System for ITSP Interoperability
This chapter provides configuration details to help you to ensure that your infrastructure properly
supports voice services.
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Configure NAT Mapping

As discussed in
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:
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Configure NAT Mapping with a Static IP Address

This option can be used if the following requirements are met:
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Use NAT mapping only if the ITSP network does not provide a Session Border Controller functionality.
Note
Log in as administrator.
Step 1
Under the Voice menu, click SIP.
Step 2
"Configure NAT Mapping," on page 1
"Firewalls and SIP," on page 5
"Configure SIP Timer Values," on page 5
Chapter 1, "Product Overview and Deployment Guidelines,"
"Configure NAT Mapping with a Static IP Address," on page 1
"Configure NAT Mapping with STUN," on page 2
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 WRP500 is the edge device, this requirement is met. If
another device is used as the edge device, see
Asymmetric NAT," on page
If the WRP500 is connected to an Ethernet switch, the switch must be configured to enable Spanning
Tree Protocol and Port Fast on the port to which the WRP500 is connected.
C H A P T E R
"Determine Whether the Router Uses Symmetric or
4.
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some form of NAT
Cisco WRP500 Administration Guide
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