add multiple mac in to attribute radiusCallingStationId

[ruben at cmg.jovenclub.cu]

hello friends have implemented a server frreeradius get LDAP attributes, 
what I need is to add multiple mac addresses to radiusCallingStationId 
attribute. I tried adding the following line in the file ldap.attrmap 
operator = ~ and separating comma MAC addresses but does not work for 
me. If anyone has implemented this by I ask for your help, thank you 
very much in advance.