Cisco WRP400-G1 Administration Guide - Page 16

NAT Mapping for Voice over IP Deployments, Local Area Network Design for Voice Deployments - ip address

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Product Overview and Deployment Guidelines Special Requirements for Voice Deployments 1 NAT Mapping for Voice over IP Deployments Network Address Translation (NAT) is the function that allows multiple devices in your small business network to share one external (public) IP address that you receive from your Internet Service Provider. Voice over IP can co-exist with NAT only when some form of NAT traversal is provided. Some Internet Telephone Service Providers (ITSPs) provide NAT traversal, but some do not. For voice deployments, it is strongly recommended that you choose an ITSP that supports NAT mapping through a Session Border Controller. If your ITSP does not provide NAT mapping through a Session Border Controller (the preferred method), you have three options for providing NAT traversal on your WRP400: • Deploy an edge device that has a SIP ALG (Application Layer Gateway). The Cisco Small Business WRV200 is suited for this purpose, but other SIP-ALG routers can be used. If your Internet Service Provider is providing the edge device, check with your provider to determine if the router has a SIP ALG. • Configure NAT mapping with the EXT IP setting. This option requires that you have (1) a static external (public) IP address from your Internet Service Provider and (2) an edge device with a symmetric NAT mechanism. If the WRP400 is the edge device, the second requirement is met. For more information about the EXT IP setting, see NAT Support Parameters section, page 70. • Configure Simple Traversal of UDP through NAT (STUN). This option requires that you have (1) a dynamic external (public) IP address from your service provider, (2) a computer running STUN server software, and (3) an edge device with an asymmetric NAT mechanism. If the WRP400 is the edge device, the third requirement is not met. For more information about the STUN Enable setting and the STUN Test Enable setting, see NAT Support Parameters section, page 70. Local Area Network Design for Voice Deployments Use the following guidelines to manage the LAN setup for voice deployments. • Ensure that all telephones are located in the same local area network subnet. • Configure your WRP400 as a DHCP server for the purpose of easily adding network devices to the system. Ensure that the DHCP server can assign Cisco Small Business WRP400 Administration Guide 14

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Product Overview and Deployment Guidelines
Special Requirements for Voice Deployments
Cisco Small Business WRP400 Administration Guide
14
1
NAT Mapping for Voice over IP Deployments
Network Address Translation (NAT) is the function that allows multiple devices in
your small business network to share one external (public) IP address that you
receive from your Internet Service Provider. Voice over IP can co-exist with NAT
only when some form of NAT traversal is provided.
Some Internet Telephone Service Providers (ITSPs) provide NAT traversal, but
some do not.
For voice deployments, it is strongly recommended that you
choose an ITSP that supports NAT mapping through a Session Border
Controller.
If your ITSP does not provide NAT mapping through a Session Border Controller
(the preferred method), you have three options for providing NAT traversal on your
WRP400:
•
Deploy an edge device that has a SIP ALG (Application Layer Gateway). The
Cisco Small Business WRV200 is suited for this purpose, but other SIP-ALG
routers can be used. If your Internet Service Provider is providing the edge
device, check with your provider to determine if the router has a SIP ALG.
•
Configure NAT mapping with the EXT IP setting. This option requires that you
have (1) a static external (public) IP address from your Internet Service Provider
and (2) an edge device with a symmetric NAT mechanism. If the WRP400 is the
edge device, the second requirement is met. For more information about the
EXT IP setting, see
NAT Support Parameters section, page 70
.
•
Configure Simple Traversal of UDP through NAT (STUN). This option requires
that you have (1) a dynamic external (public) IP address from your service
provider, (2) a computer running STUN server software, and (3) an edge device
with an asymmetric NAT mechanism. If the WRP400 is the edge device, the
third requirement
is not
met. For more information about the STUN Enable
setting and the STUN Test Enable setting, see
NAT Support Parameters
section, page 70
.
Local Area Network Design for Voice Deployments
Use the following guidelines to manage the LAN setup for voice deployments.
•
Ensure that all telephones are located in the same local area network
subnet.
•
Configure your WRP400 as a DHCP server for the purpose of easily adding
network devices to the system. Ensure that the DHCP server can assign