Hi mcbereket
Jut a guess, but it sounds like there could be a routing issue (Maybe firewall?)...
* What is in front of the UC-540 I.E what is the xDSL router
* What is the VPN configuration on the UC-540? Can you provide an extract of the VPN config??
* What is at the far end before the SPA525? Is there are router there with an inbuilt firewall and if so have you made sure it is configured to support what you are trying to achieve?
It is best to try and provide as much information, and if you have a network diagram (Jpeg format) this can also help out a fair bit if you attach it to your next reply.
Cheers,
David.
Cheers,
David Trad.
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