Web.de over OpenCom - “NO NAT” in SIP minutes

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In my SIP minutes in the OpenCom 31 LAN the regularly following lines appear:
2005-12-02 07:01: 16 STUN: NAT type for account #1 (web.de): NO NAT
2005-12-02 07:01: 31 Registering with SIP server account #1 (web.de)
2005-12-02 07:01: 31 Successfully registered with SIP server account #1 (web.de)
Is the “NO NAT” now a problem or not? To telephone I can anyhow…

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A problem is not that if you telephone can.
It points however on the fact that you registered a STUN server although the OC31 behind one do not rout are operated.
If you the STUN server entry is rausnimmst the line to disappear.