Cisco Small Business SPA509G Administration Manual page 260

Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
STUN Test Enable
STUN Server
EXT IP
EXT RTP Port Min
NAT Keep Alive Intvl
Description
If the STUN Enable feature is enabled and a valid STUN
server is available, the SPA9000 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 SPA9000
detects symmetric NAT or a symmetric firewall, NAT
mapping is disabled.
Defaults to no.
IP address or fully-qualified domain name of the STUN
server to contact for NAT mapping discovery. You can
use a public STUN server or set up your own STUN
server.
External IP address to substitute for the actual IP
address of the SPA9000 in all outgoing SIP messages.
If 0.0.0.0 is specified, no IP address substitution is
performed.
If this parameter is specified, the SPA9000 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.
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.
Interval between NAT-mapping keep alive messages.
Defaults to 15.
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