[Freeswitch-users] continuous ring back after rejecting call

I have a problem when doing an api originate to an external number with a fifo park. On some phones if the call is 'rejected' then freeswitch continuously rings back the number until it is answered. It has happened on cell phones, hard sip phones, and soft phones. Is there a way to always suppress the follow-up ring backs by setting a variable in the originate command (or something else I can set)? Thanks, Lynn