Linksys SPA 900 Series Manual De Usuario

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 Linksys 
IP phone 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 Linksys IP phone 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.

EXT IP 

External IP address to substitute for the actual IP address of the Linksys IP phone in all 
outgoing SIP messages. If 0.0.0.0 is specified, no IP address substitution is performed.

If this parameter is specified, the Linksys IP phone 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, supersede this 
statically configured value.

Defaults to blank.

EXT RTP Port Min 

External port mapping number of the RTP Port Min. number. If this value is not zero, the 
RTP port number in all outgoing SIP messages is substituted for the corresponding port 
value in the external RTP port range.

Defaults to blank. 

NAT Keep Alive Intvl 

Interval between NAT-mapping keep alive messages. 

Defaults to 15.

Linksys Key System

Enable or disable the Linksys Key System on the IP phone.

Defaults to yes.

Multicast Address

The multicast address is used by the SPA9000 to communicate with the Linksys IP IP 
phones. 

Defaults to 224.168.168.168:6061.

Force LAN Codec

The choices are: none, G.711u, or G.711a. Defaults to none.