[Freeswitch-users] Prevent Call Transfer from a specific ip network(s)

Hi guys, I have 2 network-ip list A, and B that has processed similarly in xml_dialplan. Call Scenario is pretty simple: A/B -> FS -> C. For some reasons not listed, I'm using `proxy-refer=true` to proxy REFER msg to C. Using this setting make `force_transfer_context` useless. But I want to apply REFER from A only, REFER from B needed to be rejected with 403/405 or something. All REFERs are within dialog (RFC3515) I know I can place a SIP proxy before FS to achieve this. But I don't want to add a SIP component at the moment. So, can you guide me how to do this with FreeSwitch? rgds, Loi Dang Thanh Phone : +84. 1224.735.448 Email : loi.dangthanh@gmail.com