[SR-Users] Communication from IPv6 to Ipv4

My architecture is described below: TDM device----------- Call server[IPv4]---------------[IPv4]Kamailio[IPv6]------------[IPv6]Asterisk---------[IPv6]Linphone * * * * * * * * * * * * Media Server Rtpproxy Media Server and Rtpptoxy carry the media. Call Server carry only signaling. I have succeeded to establish audio communication between an IPv6 domain & an IPv4 domain i.e. : from an TDM device to a Linphone. However, When i try to establish a call from (IPv6 to IPv4), i.e. from Linphone to TDM device, the signaling is OK, but there's no voice. Because, Rtpproxy forward the media to the Call server instead the Media Server. Hence, there can't be voice. I have been stucking on this for a couple of months. I will be very glad if somebody have any idea. best regards!