SPA3102 registers about once per second
 

My SPA3102 seems to be working just fine for calls (at least to the echo test, *600), but seems to re-register about once a second. I have:

Proxy: eu.voxalot.com
Outbound Proxy:
Use Outbound Proxy: no
Use OB Proxy In Dialog: no
Register: yes
Make Call Without Reg: no
Register Expires: 3600
Ans Call Without Reg: yes
Use DNS SRV: no
DNS SRV Auto Prefix: no
Proxy Fallback Intvl: 3600
Proxy Redundancy Method: normal
Voice Mail Server: eu.voxalot.com
Mailbox Subscribe Expires: 2147483647

On gw1 I have NAT mapping enabled, with a keep alive interval of 59

I don't see any reason why it would keep successfully registering, unless the server is telling it to.

Any thought as to what I may have missed?

Thanks,
Ratbert