SPA 3102- STUN SERVER NOT REACHABLE

Hello,
Following are Line 1 settings of an SPA-3102
Nat mapping enabled=yes
Nat keep alive enabled=yes
Proxy server:correct proxy server specified
Outbound proxy server: Correct outbound proxy server specified
UserID and passwords are configured properly
SIP TAB:
RTP port min=16384
RTP port max=16390
Handle via received=yes
Insert via received=yes
Substitute via addr=yes
STUN enable=yes
STUN Server=aa.aa.com (correct STUN server configured)
Hadle via rport=yes
Inser via rport=yes
Send resp to SRC port=yes
STUN test enable=yes
TURN server=not configured
STUN test enable=yes
EXT IP=not configured
NAT keep alive INTVL=15
Problem:
On the REGISTER message I am receiving following warning
Warning: 399 spa "STUN Server Not Reachable"
User-Agent: Linksys/SPA3102-5.1.7(GW)
Content-Length: 0
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura, replaces
Would you please explain why I receive STUN not reachable warning? It is a reachable STUN server. SPA 3102 devices are placed behind ADSL modems of ITSP

I just noticed that you have Handle VIA received = yes, so if the proxy is responding with a 'received' tag, then the SPA would learn its external IP, without needing to contact the STUN server.  I have a system that is behind NAT but does not need STUN or symmetric RTP, because it uses the IP from the received tag in the SDP. (In my case, I have the RTP ports forwarded to the SPA, so no port number translations are needed.)

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