hello i tried to use nibblebill, here is my configuration: *User Directory:* <include> <user id="3001"> <params> <param name="password" value="1234"/> </params> <variables> <variable name="toll_allow" value="domestic,international,local"/> <variable name="user_context" value="default"/> <variable name="nibble_account" value="3001"/> </variables> </user> </include> *Dialplan:* <include> <extension name="Test"> <condition field="destination_number" expression="880"> <action application="set" data="nibble_rate=0.035"/> <action application="set" data="$${nibble_account}"/> <action application="bridge" data="sofia/gateway/asterisk/${destination_number}"/> </condition> </extension> I got following error 2011-09-16 17:18:36.866801 [DEBUG] mod_dptools.c:1167 sofia/external/ 3001@192.168.7.21 SET [nibble_rate]=[0.035] EXECUTE sofia/external/3001@192.168.7.21 set() 2011-09-16 17:18:36.866801 [ERR] mod_dptools.c:1145 No variable name specified. can anyone help me to find the issue, i follwed the *Mod_nibblebill wiki Single Rate for all users section*. Regards shaon