You can also evaluate my take on whether Kamailio is interchangeable with "SBC": https://likewise.am/2013/03/10/kamailio-as-an-sbc-session-border-controller/ -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 (direct) / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/