Configuring Your System for ITSP Interoperability
Network Address Translation (NAT) and Voice over IP (VoIP)
SPA9000 Voice System Administration Guide
50
3
Requirements:
•
You must have an external (public) IP address that is static.
•
The NAT mechanism used in the router must be symmetric. See
“Determining
Whether the Router Uses Symmetric or Asymmetric NAT,” on page 53
.
•
The LAN switch must be configured to enable Spanning Tree Protocol and Port
Fast on the ports to which the SPA devices are connected.
NOTE
Use NAT mapping only if the ITSP network does not provide a Session Border
Controller functionality.
STEP 1
Connect to the administration web server, and choose Admin access with
Advanced settings.
STEP 2
Click
Voice tab > SIP
.
STEP 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.
Voice tab > SIP: NAT Support Parameters
STEP 4
Click
Voice tab > Line
N
, where
N
represents the line interface number.
STEP 5
Scroll down to the
NAT Settings
section.
•
NAT Mapping Enable:
Choose
YES
.
•
NAT Keep Alive Enable:
Choose
YES
(optional).
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