10-Oct-2016 14:58

What is the CDR Analysis for VoIP Termination?


CDR stands for Call Detail Record or Charging Data Records (Record the details of the call / write data on the write-off). The service is widely used in the telecommunications business, particularly in the field of VoIP termination. Its main function is a logging of the VoIP equipment operation.

CDR is used when calculating the cost of calls to assess the rationality of traffic, as well as diagnosing problems in the system and the implementation of specific hardware configuration. Generally, CDR-service works in conjunction with billing programs for termination. In turn, based on the data records details of calls, the billing generates an account for calls in VoIP networks, calculates statistics of the load on the channel, subscriber activity statistics, etc.

CDR is usually built in VoIP equipment by default. It is also provided in the Asterisk voip server. The program creates a record for calls to __ / var / log / asterisk / cdr-csv. All entries are read in Master.csv file.

CDR usually contains the following information on calls:

  • Initiation of a call;
  • Call destination;
  • Start time of the call;
  • The actual connection time;
  • Call completion time.
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Based on of data from the CDR records, such figures as ACD and ASR, characterizing the average duration of calls and the ratio of successful/unsuccessful calls are calculated. They demonstrate the quality of a VoIP connection. Also, the CDR, as a rule, logs "zero calls". They are calls that did not take place because there was no connection established, and calls that lasted less than 1 second, in which the user himself ends the conversation because of poor communication.

There is also the CMR service (Call Management Records), which logs data on the quality of VoIP service (QoS) and diagnostic information about the call. CMR records contain the following data on the calls:

  • The value of jitter ("digital signal jitter");
  • The amount of data received and transmitted;
  • Delays in data delivery;
  • Percentage of loss of traffic packages.

By analyzing these statistics, you can draw conclusions about the performance of your VoIP system and take appropriate measures to improve the productivity of GSM termination.

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