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Splunk Lantern

Total call minutes by subscriber

You might want to calculate the total call minutes by subscribers within a certain set of countries when doing the following:

Prerequisites 

In order to execute this procedure in your environment, the following data, services, or apps are required:

Example

You work for a large telecommunications provider and use Splunk to monitor the services you provide. You need a search that will give insight into where your users are calling, as well as the total duration of all their calls.

To optimize the search shown below, you should specify a time range.  You may also need to adjust fields to match what is available in your data source. 

  1. Ensure your lookup files are uploaded to your Splunk deployment.
  2. Run the following search:
    | sourcetype=<call detail records>
    | eval _time = start
    | lookup <cdr disposition mapping file> disposition
    | search disposition="ANSWERED" OR billable > 0
    | rex field=dst "(?<dstCountry>\d+)(?=\d{10})"
    | lookup <country code to name mapping file> phoneCode AS dstCountry OUTPUTNEW countryName as dstCountryName ISO2 AS dstCountryCode
    | fields _time accountcode src billable dstCountryCode
    | convert dur2sec(billable) AS calculatedBillableS
    | stats values(accountcode) AS Account values(dstCountryCode) AS CalledCountries sum(eval(round((calculatedBillableS/60),0))) AS BillableMinutes BY src
    | nomv CalledCountries
    | rename src AS "Caller" BillableMinutes AS "Billable Minutes"
    | table Account Caller CalledCountries "Billable Minutes"
    | sort - "Billable Minutes"

Search explanation

The table provides an explanation of what each part of this search achieves. You can adjust this query based on the specifics of your environment.

Splunk Search Explanation
| sourcetype=<call detail records> Search only your telephony data.
| eval _time = start Extract the timestamp and put it in a field called "start".
| lookup <cdr disposition mapping file> disposition

Enrich the search results with clearer descriptions of the dispositions.

If your lookup file does not contain the disposition column, adjust the search to match the names in your lookup.

| search disposition="ANSWERED" OR billable > 0 Search for billable call events, identified with a disposition of ANSWERED or where the billable field has a value greater than 0.
| rex field=dst "(?<dstCountry>\d+)(?=\d{10})"

Extract the destination (dst) country code.

This example assumes that the country code is what precedes a 10 digit number.

| lookup <country code to name mapping file> phoneCode AS dstCountry OUTPUTNEW countryName as dstCountryName ISO2 AS dstCountryCode

Enrich the results by adding a country name and iso code, based on the dstCountry field extracted.

If the column names in your lookup file differ from those shown here, adjust the search to match the names in your lookup.

| fields _time accountcode src billable dstCountryCode Return only the fields shown.
| convert dur2sec(billable) AS calculatedBillableS Convert the value in the billable field to a numerical value in seconds without replacing the original values.
| stats values(accountcode) AS Account values(dstCountryCode) AS CalledCountries sum(eval(round((calculatedBillableS/60),0))) AS BillableMinutes BY src Return the values for account codes and destination countries. Calculate billable minutes based on the summated call durations rounded to the nearest minute, then sort by source.
| nomv CalledCountries Convert this multivalue CalledCountries field into single values.
| rename src AS "Caller" BillableMinutes AS "Billable Minutes" Rename the fields as shown for better readability.
| table Account Caller CalledCountries "Billable Minutes" Display the results in a table with columns in the order shown.
| sort - "Billable Minutes" Sort the results with the largest amount of billable minutes first.

Result

Use this information for targeted marketing campaigns, billing reconciliation, and capacity and service forecasting.