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Linksys SPA9x2 Phone Administration Guide 53
Linksys Key System Parameters
Setting SIP Parameters
NAT Support Parameter Notes
• STUN Enable: Enables the use of STUN to discover NAT mapping. Select yes or no from
the drop-down menu. Defaults to no.
• STUN Test Enable: If the STUN Enable feature is enabled and a valid STUN server is
available, the SPA9x2 can perform a NAT-type discovery operation when it powers on. It
contacts the configured STUN server, and the result of the discovery is reported in a
Warning header in all subsequent REGISTER requests. If the SPA9x2 detects symmetric
NAT or a symmetric firewall, NAT mapping is disabled.
Defaults to no.
• STUN Server: IP address or fully-qualified domain name of the STUN server to contact for
NAT mapping discovery. You can get open-source STUN software at the following
website:
http://www.voip-info.org/wiki-STUN
> “Public STUN Servers” section.
Use any public STUN server from the link above for the STUN Server parameter.
• EXT IP: External IP address to substitute for the actual IP address of the SPA9x2 in all
outgoing SIP messages. If 0.0.0.0 is specified, no IP address substitution is performed. If
this parameter is specified, the SPA9x2 assumes this IP address when generating SIP
messages and SDP (if NAT Mapping is enabled for that line). However, the results of
STUN and VIA received parameter processing, if available, supercede this statically
configured value.
Defaults to blank.
Linksys Key System Parameters
Linksys Key System Notes
• Linksys Key System: enables or disables the Linksys Key System for use with the LVS
SPA9000. Defaults to yes. See the LVS Administration Guide for more details.
• Multicast Address: used by the SPA9000 to communicate with SPA9x2 phones. Defaults
to 224.168.168.168:6061.
• Force LAN Codec: for use with the LVS. Choices are G.711u or G.711a. Defaults to none.