Linksys SPA 900 manual Linksys Key System Parameters, Ext Ip

Chapter 5 Linksys IP Phone Field Reference

	SIP Tab
Field	Description
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 Parameters

Field	Description
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.

	Linksys IP Phone Administrator Guide
Firmware Version 5.1		5-17