+Asterisk billing support - Call Detail Records
+----------------------------------------------
+Asterisk generates Call Detail Records in a database or in a comma
+separated text file.
+ * cdr_csv supports comma separated text file storage, this is the
+ default driver
+ * cdr_odbc supports UnixODBC databases, see http://www.unixodbc.org
+ for an updated list of supported databases, from MySQL to MsSQL
+ and text files.
+
+
+
+Applications
+------------
+
+ * Asterisk cmd setaccount: Set accound code for billing
+ * Asterisk cmd NoCDR: Make sure no CDR is saved for a specific call
+ * Asterisk cmd resetCDR: Reset CDR
+ * Asterisk cmd authenticate - Authenticates and sets the account code
+ * Asterisk cmd SetCDRUserField - Set CDR user field
+ * Asterisk cmd AppendCDRUserField - Append data to CDR User field
+
+For more information, use the "show application" command.
+
+
+Fields of the CDR in Asterisk
+-----------------------------
+
+ 1. accountcode: What account number to use, (string, 20 characters)
+ 2. src: Caller*ID number (string, 80 characters)
+ 3. dst: Destination extension (string, 80 characters)
+ 4. dcontext: Destination context (string, 80 characters)
+ 5. clid: Caller*ID with text (80 characters)
+ 6. channel: Channel used (80 characters)
+ 7. dstchannel: Destination channel if appropriate (80 characters)
+ 8. lastapp: Last application if appropriate (80 characters)
+ 9. lastdata: Last application data (arguments) (80 characters)
+ 10. start: Start of call (date/time)
+ 11. answer: Anwer of call (date/time)
+ 12. end: End of call (date/time)
+ 13. duration: Total time in system, in seconds (integer), from dial to hangup
+ 14. billsec: Total time call is up, in seconds (integer), from answer to hangup
+ 15. disposition: What happened to the call: ANSWERED, NO ANSWER, BUSY
+ 16. amaflags: What flags to use: DOCUMENTATION, BILL, IGNORE etc,
+ specified on a per channel basis like accountcode.
+ 17. user field: A user-defined field, maximum 255 characters
+
+In some cases, uniqueid is appended:
+
+ * uniqueid: Unique Channel Identifier (32 characters)
+ This needs to be enabled in the source code at compile time
+