import bitel.billing.server.radius.*;
import bitel.billing.server.script.bean.event.*;
import bitel.billing.server.contract.bean.*;

MAC_ID = 35;

request  = event.getRequest();

macc = request.getStringAttribute(RadiusStandartAttributes.Calling_Station_Id);
cid = event.getContractID();

new_mac = new ContractParameterManager( con );
new_mac.setStringParam( cid, MAC_ID, macc );

WARNINGS:
Function [id:4; title:mac]: using deprecated method [public void bitel.billing.server.contract.bean.ContractParameterManager.setStringParam(int,int,java.lang.String)]

import bitel.billing.server.radius.*;
 
prefix = "client-mac-address";
length = prefix.length();
 
attributes = request.getVendorAttributes( Vendors.CISCO, CiscoVendor.Cisco_AVPair );
if( attributes != null )
for( it = attributes.iterator(); it.hasNext(); )
{
     ra = (RadiusAttribute)it.next();
     value = ra.getStringValue();
 
     if( value.startsWith( prefix ) )
     {
        request.setStringAttribute( RadiusStandartAttributes.Calling_Station_Id, value.substring( length + 1 )  );
     }
}