[asterisk-users] Can't park call more than once

[asterisk at voipbusiness.us]

All;
     I am running Asterisk 11.6-cert13 and am having a problem when 
parking a caller. A call comes in and I put them on hold with *1 
(defined in features.conf) without a problem. I can then dial the parked 
call extension number, say 701, and retrieve the call. The problem I'm 
having is if I try to park the call again, nothing happens. I hear a 
beep when I hit *1, but thats it. Has anyone seen this before? Any 
insight at all would be greatly appreciated.
Thanks;
John V.