[Freeswitch-users] error sip 500

Hi all, Im trying to bridge 2 softswitch (sysmaster and mera mvts 2) using fs, i already setup the dialplan and external gateway in the sip profile but i'm having this trouble when trying to send call to the mvts 2, sometime the call could establish fine and the next minute the call to the same number failed with this error : variable_proto_specific_hangup_cause: [sip:500] variable_originate_disposition: [NORMAL_TEMPORARY_FAILURE] variable_hangup_cause: [NORMAL_TEMPORARY_FAILURE] what can cause this error? every failed call is never logged at the mvts2 box as like fs never sends the call but at the fs log i see that it already send the call to the right gateway (mvts2). -Pieter-