Hi all, I have user 20@domain registering both via SIP profile a and SIP profile b. SIP profile A and B each have their own public IP. On SIP profile A, user 20@domain registers with a Softphone. On SIP profile B, user 20@domain registers with a Polycom phone. Both the Softphone and the Polycom are behind the same NAT. SIP profile A is using the default NAT configuration. SIP profile B is using a special hack to handle NAT for Polycom phones, as follows: <param name="NDLB-force-rport" value="true"/> After that, if both SIP profile A and SIP profile B are loaded, only the Polycom is able to register. The softphone does gets by, packets go and come back, but FS does not seem to register it. If I disable the Polycom profile, the Softphone can register fine. My temporary solution is to register both under the Polycom profile, but it's a little unreliable. What are your suggestions at this point? Best, Emrah