Linksys BUSINESS SPA922 - Manual (Page 147)

Linksys SPA9x2 Phone Administration Guide
Cisco Confidential--First Draft
140
SIP Tab
SPA9x2 Phone Field Reference
Linksys Key System Parameters
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.
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, 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.
Parameter Description
Linksys Key System Enable or disable the Linksys Key System on the IP
phone.
Defaults to yes.
Parameter Description