N95-2 Incoming VOIP Calls

Hi
Has anyone else had this problem and/or found a fix:
I have N95-2 updated to the latest firmware.
The Internet telephony works fine for making and receiving calls (I use Sipgate).
However if a caller rings in and withholds CallerID, the phone does not ring and the caller receives a message saying "The other person has hung up". If callerID is transmitted, the phone rings OK.
I have checked the routers and the call is being sent to the handset OK.
Any suggestions?
Thanks.

Is this device behind NAT ? You might be needing to forward some SIP ports on the firewall side to let the call come in.  Additionally, there are available parameters on the PAP2T that will help you with the NAT issue , NAT mapping and NAT keep alive, use STUN or Outbound proxy if available. 

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