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Splunk Lantern

Countries with the highest and lowest call volumes


​​The table below explains in detail the steps of a Splunk Enterprise or Splunk Cloud Platform search to see which countries have the highest or lowest call volumes. For more information, review the use case monitoring key telecommunications service metrics.

Some commands, parameters, and field names in the searches below may need to be adjusted to match your environment.  In addition, to optimize the searches shown below, you should specify an index and a time range when appropriate.

Splunk recommends that customers look into using data models, report acceleration, or summary indexing when searching across hundreds of GBs of events in a single search. The searches provided here are a good starting point, but depending on your data, search time range, and other factors, more can be done to ensure that they scale appropriately.   

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".
| 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

Enrich the results by adding a country name, 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.

| stats count BY dstCountryName Calculate a count for the results and sort by destination country.
| sort - count Sort the results with the largest count first, or remove the - to sort with the lowest call volume first.
| head 10 Limit the results to the top 10.