Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 253
B
STUN Test Enable If the STUN Enable feature is enabled and a valid STUN
server is available, the 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 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. You can
use a public STUN server or set up your own STUN
server.
EXT IP External IP address to substitute for the actual IP
address of the 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 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.
Parameter Description
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