All. I m using SER 0.9.7pre1 with RTPProxy and this box sits on the boundary of private and public networks. REGISTERs hit this box from public side and are forwarded to private side for registration processing. The message is forwarded to the private ip but there are two weird things I noticed .. a) Even though the packet leaves from the private interface the src ip address is set to public IP b) Newly added Via header has public side IP address and not the private side IP address. This causes problems in routing the response to REGISTER method. Any suggestions welcomes Thanks Gaurav Kulshreshtha