Configuring Nat Mapping With Stun - Linksys SPA9000 Administration Manual

Configuring the SPA9000 for ITSP Interoperability
4. Click Voice tab > Line N, where N is the number of the line interface for the ITSP service that
you need to configure.
5. Scroll down to the NAT Settings section.
• NAT Mapping Enable: Choose YES.
• NAT Keep Alive Enable: Choose YES (optional).
NOTE: Your ITSP may require the SPA9000 to send NAT keep alive messages to keep the
NAT ports open permanently. For more information, see
in LVS Administration," "SIP-NAT Interoperation" section on page
6. Click Submit All Changes.
NOTE: You also need to configure the firewall settings on your router to allow SIP traffic. See
"Firewalls and SIP, " on page

Configuring NAT Mapping with STUN

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 assigned dynamically by the network (and the router uses asymmetric NAT
mechanism), it is possible to use STUN as a mechanism to discover the NAT mapping in
SPA9000. This is considered a practice of last resort and should be used only if the other
methods are unavailable.
STUN is a viable option only if your router uses asymmetric NAT. See
Note
Appendix A, "Advanced Topics in LVS Administration," "Determining
Whether the Router Uses Symmetric or Asymmetric NAT" section on
page
1. Connect to the SPA9000 administration web server, and choose Admin access with
Advanced settings. (See
page 24.)
2. Click Voice tab > SIP.
Linksys Voice System Administration Guide
Network Address Translation (NAT) and Voice over IP (VoIP)
SPA9000 Voice > SIP: NAT Support Parameters
43.
136.
"Connecting to the SPA9000 Administration Web Server, " on
Appendix A, "Advanced Topics
135.
42