1402s, находящийся за программным рутером, неверно определяет тип NAT.
конфигурация:
Inet<--->FreeBSD<---> 1402s (воткнут WAN портом)
подсеть, в которой находится 1402, серая.

1402:
Boot PROM Version 1.00.003
Firmware Version 1.00.008GNR
DSP Version 0.11.8.4
SIP Version 1.0.5

оператор: sipnet.ru

диагностика:

============ STUN general infomation =============
STUN state : on
STUN req interval : 60
STUN server ip : 212.53.35.244
STUN server port : 3478
STUN NAT type : UDP Blocked
========== STUN mapped infomation for SIP ==========
Endpoint[1] SIP Message socket mapped ip/port : 0.0.0.0 : 0
Endpoint[1] SIP RTP socket mapped ip/port : 0.0.0.0 : 0
Endpoint[2] SIP Message socket mapped ip/port : 0.0.0.0 : 0
Endpoint[2] SIP RTP socket mapped ip/port : 0.0.0.0 : 0
OK

......................


Doing STUN NAT Type Determining process, please wait for the result
001059167 STUN: Sending STUN request for TestI, count = 1
001059167 STUN: Transaction ID: 53 54 55 4e 1 c8 ed 92 db 42 96 35 8c ef 88 b7
001059167 STUN: Encoding stun message:
001059167 STUN: Encoding ChangeRequest: 0, No Change IP and Port
001059167 STUN: About to send msg of len 28 to 212.53.35.244:3478
001059167 STUN: waiting for response timeout = 10 ms
001059168 STUN: Received stun message: 88 bytes
001059168 STUN: MappedAddress = 88.201.136.175:12345
001059168 STUN: SourceAddress = 212.53.35.244:3478
001059168 STUN: ChangedAddress = 212.53.35.253:3479
001059168 STUN: Unknown attribute: 32
001059168 STUN: Parse STUN message fail

<blah-blah>

Test I = 0
Test II = 0
Test III = 0
Test I(2) = 0
Is NAT = 0
Mapped IP same = 0
STUN NAT type : UDP Blocked

запускаем WinStun на тот же stun server с машины, стоящей в той же чети, что и 1402:

Nat with Independend Mapping and Port Dependent Filter - VoIP will work with STUN
Preserves port number
Does not supports hairpin of media
Public IP address: 88.201.136.175

что за дела?