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Splunk Lantern

Successful call statistics by geography

You might want to map successful calls by the destination country 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 customers are calling the most.

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 disposition="BUSY"
    | rex field=dst "(?<dstCountry>\d+)(?=\d{10})"
    | lookup <country code to name mapping file> phoneCode AS dstCountry OUTPUTNEW countryName as dstCountryName ISO2 AS dstCountryCode
    | stats count BY dstCountryName
    | geom geo_countries allFeatures=true featureIdfield=dstCountryName

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 disposition="BUSY" Search for successful call events, identified with a disposition of ANSWERED or BUSY.
| 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.

| stats count BY dstCountryName Calculate a count for the results and sort by destination country.
| geom geo_countries allFeatures=true featureIdfield=dstCountryName

Map the results count by country, using the dstCountryName field as the Feature ID.

You could also use a top command to pull data into a visualization.

Result

Review the results for abnormalities in expected call behavior. Then, use the information to negotiate lower rates for voice traffic or increase prices.