[Serusers] audiocodes mp104

hi guys, has anyone of you done any interop with audiocodes fxs? i've tried 2 firmware versions but i still get sip stack errors. like this Sep 16 11:42:47 10.17.3.1 ( lgr_stk_mngr)( 330)!! [ERROR] StackMngr: Message was not Parsed correctly ! Last parsed line was :MaxForwardsHeader: Sep 16 11:42:47 10.17.3.1 ( lgr_stk_mngr)( 331)!! [ERROR] The error was = Unexpected '>' Sep 16 11:42:47 10.17.3.1 ( lgr_stk_mngr)( 332)!! [ERROR] The Line of the error was = 3 Sep 16 11:42:47 10.17.3.1 ( lgr_stk_mngr)( 333)!! [ERROR] The Column of the error was = 82 i'm currently stuck, maybe i could get some ideas from you guys thanks ~kelvin