Nat Mapping With Session Border Controller; Configuring Nat Mapping With A Static Ip Address - Linksys SPA9000 Administration Manual

Configuring the SPA9000 for ITSP Interoperability

NAT Mapping with Session Border Controller

It is strongly recommended that you choose an ITSP that supports NAT mapping through a
Session Border Controller (see
more choices in selecting a router.
Figure 3-3 NAT Support with Session Border Controller Provided by ITSP
192.168.1.101 192.168.1.102
SPA9000

Configuring NAT Mapping with a Static IP Address

Configuring NAT mapping in the SPA9000 is recommended only if the ITSP network does not
provide a Session Border Controller functionality. In this case, and if the external (public) IP
address is static, then it is recommended to perform a static (permanent) mapping on SPA9000.
This setting is also recommended if NAT mechanism used in the router is symmetric.
The LAN switch needs to be configured to enable Spanning Tree
Note
Protocol and Port Fast on the ports to which the SPA9000 and the
SPA9xx phones are connected.
1. Connect to the SPA9000 administration web server, and choose Admin access with
Advanced settings. (See
page 24.)
2. Click Voice tab > SIP.
3. Scroll down to the NAT Support Parameters section, and then enter the following settings to
support static mapping to your public IP address:
• Handle VIA received, Insert VIA received, Substitute VIA Addr: yes
• Handle VIA rport, Insert VIA rport, Send Resp To Src Port: yes
• EXT IP: Enter the public IP address for your router.
Linksys Voice System Administration Guide
Network Address Translation (NAT) and Voice over IP (VoIP)
Figure 3-3). With NAT mapping provided by the ITSP, you have
Private IP address
192.168.1.1
NAT Device
Router and
DHCP
DHCP Server
server
SIP Proxy
192.168.1.100
"Connecting to the SPA9000 Administration Web Server, " on
External IP address
assigned by ISP
Internet
ISP
ITSP
Session Border
Controller
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