© 2003 - 2005 Sipura Technology, Inc
Proprietary (See Copyright Notice on Page 2)
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2. SPA ignores the codec names in incoming SDP for standard payload types (0 – 95).
3. For dynamic payload types, SPA identifies the codec by the configured codec names. Comparison
is case-insensitive.
3.5.6.3. NAT
Support
Parameter Name
Description
Type
Default
Handle_VIA_received
If set to “yes”, the SPA 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 SPA 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 SPA 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 spa <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 SPA 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
