Asterisk billing support - Call Detail Records
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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_manager supports CDR information via the AMI, The Asterisk Manager
     interface
   * cdr_odbc supports UnixODBC databases, see http://www.unixodbc.org
     for an updated list of supported databases, from MySQL to MsSQL
     and text files.
   * cdr_tds supports FreeTDS databases (Among them MS SQL)
   * cdr_sqlite supports SQlite
   * cdr_pgsql supports PostgreSQL

In the asterisk-addons cvs archive, there's a cdr_mysql driver for
MySQL.



Applications
------------

    * setaccount  	Set account code for billing
    * setAMAflags 	Sets AMA flags
    * NoCDR  		Make sure no CDR is saved for a specific call
    * resetCDR  	Reset CDR
    * forkCDR 		Save current CDR and start a new CDR for this call
    * authenticate 	Authenticates and sets the account code
    * SetCDRUserField   Set CDR user field
    * AppendCDRUserField   Append data to CDR User field 

For more information, use the "show application" command.
You can set default account codes and AMA flags for devices in 
channel configuration files, like sip.conf, iax.conf etc.


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: Answer 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


ONE IMPORTANT NOTE: If you are trying to collect records on IAX to IAX calls
you need to be aware that by default, IAX will attempt to transfer calls
in this situation (if DTMF is not required).  When the transfer is completed
the call is dumped from the middle machine and thus the call detail records
will report a short call time.  If you want detailed records you must
turn off IAX transfer, but unless your servers are very close together, you
will definitely get a latency hit from doing so.


