Linksys Voice System Administration Guide
167
Voice tab
Voice tab > SIP page
PBX Parameters section
STUN Enable
Enables the use of STUN to discover NAT mapping. Select yes
or no from
the drop-down menu.
Default:
no
STUN Test Enable
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 asymmetric NAT or
asymmetric firewall, NAT mapping is disabled.
Default:
no
STUN Server
IP address or fully-qualified domain name of the STUN server to contact
for NAT mapping discovery.
Default: blank
EXT IP
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, or the field is left
blank, no IP address substitution is performed.
NOTE:
You must also configure port forwarding for SIP [5060-5063] and
RTP [16384-16482] when using the EXT IP field, or phone users may
experience one-way audio because the RTP stream will not find its way
between the two phones.
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.
Default: 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.
Default: blank
NAT Keep Alive Intvl
Interval between NAT-mapping keep alive messages.
Default:
15
Field
Description
Proxy Network Interface
This setting tells the SPA9000 how the client stations are connected.
Choices: {LAN, WAN}. The SPA9000 communicates with client stations
via the selected interface only.
Default:
WAN
NOTE:
For optimum voice performance, Linksys Engineering and
Quality Assurance recommend that only WAN is used.
Proxy Listen Port
Port at which the SPA9000 listens for client messages at the selected
network interface. The proxy also sends SIP messages from this port.
Default:
6060