Hello, Everybody I am using mod_nibblebill for billing of realtime calls.Its heartbeat fire does not fire after 1 second as i have specified in my nibblebill.conf.xml file. After call is completed nibblebill update the database balance column according to given formula. [time call ended] - [time call answered] x [rate per minute] = $total bill rate Though this formula is used when global_heartbeat is off. Here is my nibblebill.conf.xml <configuration name="nibblebill.conf" description="Nibble Billing"> <settings> <param name="odbc-dsn" value="odbc://freeswitch"/> <param name="db_table" value="users"/> <!-- The column name where we store the value of the account --> <param name="db_column_cash" value="balance"/> <!-- The column name for the unique ID identifying the account --> <param name="db_column_account" value="accountcode"/> <!-- Custom SQL for loading current balance - overrides column names channel vars are interpreted. field nibble_balance is used for balance info <param name="custom_sql_lookup" value="SELECT cash AS nibble_balance FROM accounts WHERE account_code='${nibble_ account}'"/> --> <!-- Custom SQL for loading current balance - overrides column names channel vars are interpreted. nibble_increment is the amount to update <param name="custom_sql_save" value="UPDATE accounts SET cash=cash-${nibble_increment} WHERE account_code='${nibble_account}'"/> --> <!-- Default heartbeat interval. Set to 'off' for no heartbeat (i.e. bill only at end of call) --> <param name="global_heartbeat" value="1"/> <!-- By default, warn a caller when their balance is at $5.00. You can set this to a negative number. --> <param name="lowbal_amt" value="5"/> <param name="lowbal_action" value="play ding"/> <!-- By default, terminate a caller when their balance hits $0.00. You can set this to a negative number. --> <param name="nobal_amt" value="0"/> <param name="nobal_action" value="hangup"/> <!-- If a call goes beyond a certain dollar amount, flag or terminate it --> <param name="percall_max_amt" value="0"/> <param name="percall_action" value="hangup"/> </settings> </configuration> When i apply this on Freeswitch cli for channel uuid i get this.. freeswitch@internal> nibblebill 3f3f3b4a-fe4e-47d0-a43a-e1d8a54c6dfe check -ERR no reply 2014-09-19 04:30:38.704124 [INFO] mod_nibblebill.c:793 Can't check - channel is not initialized for billing! 2014-09-19 04:30:38.704124 [INFO] mod_nibblebill.c:888 Current billing is at $-99999.000000 Can someone please tell where i am doing something wrong.:)