I had the same problem with my SPA-3102. Whenever I enable the options
- Handle VIA received
- Insert VIA received
- Handle VIA rport
- Insert VIA rport
as some posts on the net suggest, I get the exact same behaviour. I did read somewhere this was due to the fact I'm also using a STUN server and that if 'STUN test' was set to yes the 1sec registration issue would go away.
Unfortunately that didn't happen, so I just the turned off the above options and enabled "Substitute VIA Addr", "Send Resp To Src Port" and "STUN Enable". That seems to do the trick and works without a hitch.
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