SIP registration problem
Do you have a static or a dynamic public IP assignment on your internet connection (on the WAN side)?
I'm asking this because I know some hardware that looses it's registration when public IP changes. I'm thinking about a SAGEM FAST modem+router+ATA used by PT.com which looses SIP registration when there is an IP change in the WAN side. I'm used with the formerly Linksys hardware which seems to work great. The phone you refer I don't know, but from your words I suspect that you can be having some problem like what happens with the mentions SAGEM FAST ADSL router.
Regards.
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