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ADAPTER. Also, set the Substitute_VIA_Addr and NAT_Mapping_Enable parameters. Follow the
instructions of the NAT software to configure static NAT mappings between the external address and
ports (EXT_SIP_Port, EXT_RTP_Port_Min) and the internal address and ports (SIP_Port,
RTP_Port_Min). Set the RTP_Port_Max parameter to a smaller number (for example, RTP_Port_Min
plus 8). There must be mappings for the every port number between RTP_Port_Min and
RTP_Port_Max when using the Manual Configuration approach. Reserving 8 ports is safe, since it
allows both lines to have two simultaneous calls with a port for RTP and RTCP.
Parameter Name Description Type Default
Handle_VIA_received If set to “yes”, the PHONE ADAPTER will process
the “received” parameter in the VIA header inserted
by the server in a response to any one of its
request. Else the parameter is ignored.
Bool No
Handle_VIA_rport If set to “yes”, the PHONE ADAPTER will process
the “rport” parameter in the VIA header inserted by
the server in a response to any one of its request.
Else the parameter is ignored.
Bool No
Insert VIA received Insert received parameter in VIA header in SIP
responses if received from IP and VIA sent-by IP
differ
Bool No
Insert VIA rport Insert rport parameter in VIA header in SIP
responses if received-from port and VIA sent-by
port differ
Bool No
Substitute VIA addr Use nat-mapped IP:port values in VIA header Bool No
Send Resp To Src Port Send response to the request source port instead
of the VIA sent-by port
Bool No
STUN Server STUN server to contact for NAT mapping discovery FQDN
STUN Enable Enable the use of STUN to discover NAT mapping Bool No
STUN Test Enable If enabled with <STUN Enable> = “yes” and a valid
<STUN Server>, the PHONE ADAPTER will
perform a NAT type discovery operation when first
power on by contacting the configured STUN
server. The result of the discovery will be reported
in a Warning header in all subsequent REGISTER
requests –
“Warning: 399 Phone Adapter <stun type>”, where
<stun type> is one of the following:
"Unknown NAT Type",
"STUN Server Not Reachable",
"STUN Server Not Responding",
"Open Internet Detected",
"Symmetric Firewall Detected",
"Full Cone NAT Detected",
"Restricted Cone NAT Detected",
"Symmetric NAT Detected";
If the PHONE ADAPTER detects Symmetric Nat or
Symmetric Firewall, Nat Mapping will be disabled
(that is, no substitution of IP address and port with
external IP address an nat-mapped port)
Bool No
Ext IP External IP address to substitute for the actual IP
address of the unit in all outgoing SIP messages. If
“0.0.0.0” is specified, no IP address substitution is
performed.
IP 0.0.0.0
© 2004 Linksys Proprietary (See Copyright Notice on Page 2)
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