DRAFT
© 2003 - 2005 Sipura Technology, Inc
Proprietary (See Copyright Notice on Page 2)
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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)
Ext IP
If this parameter is specified, the SPA will assume this IP
address when generating SIP messages and SDP (if NAT
Mapping is enabled for that Line). However, results of
STUN and VIA received parameter processing, if
available, will supersede this statically configured value
IP
Ext RTP Port Min
External port mapping of <RTP Port Min>. If the
parameter is specified and non-zero, the SPA will use this
value to compute the corresponding external RTP port of
a connection and use the result in the SDP for
establishing the connection. However, results of STUN, if
available, will supersede this statically configured value
Port
NAT Keep Alive Intvl
This is the interval at which keep alive messages are sent
by the SPA to preserve a NAT mapping. It controls the
interval for sending keep alive messages for the SIP
signaling ports and also for the RTP ports.
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