Linksys ATA Administration Guide
108
SIP page
Insert VIA rport
Inserts the parameter into the VIA header of SIP responses if the received-
from IP and VIA sent-by IP values differ. Select yes
or
no from the drop-down
menu.
The default is
no
.
Substitute VIA Addr
Lets you use NAT-mapped IP:port values in the VIA header. Select yes
or
no
from the drop-down menu.
The default is
no
.
Send Resp To Src Port
Sends responses to the request source port instead of the VIA sent-by port.
Select yes
or
no from the drop-down menu.
The default is
no
.
STUN Enable
Enables the use of STUN to discover NAT mapping. Select yes
or no from the
drop-down menu.
The default is
no
.
STUN Test Enable
If the STUN Enable feature is enabled and a valid STUN server is available, the
ATA device 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 ATA
device detects symmetric NAT or a symmetric firewall, NAT mapping is
disabled.
The default is
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 ATA device in
all outgoing SIP messages. If 0.0.0.0 is specified, no IP address substitution is
performed.
If this parameter is specified, the ATA device 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.
The default is
0.0.0.0
.
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.
The default is
0
.
NAT Keep Alive Intvl
Interval between NAT-mapping keep alive messages.
The default is
15
.