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Turning Call Detail Records into Decisions: A Practical Analytics Guide
Every business phone system produces call detail records, and most businesses never look beyond call counts. The records contain considerably more: who called whom, when, for how long, on which trunk, at what cost, and how it ended. That detail supports decisions that call counts alone cannot inform. The difficulty is not the data, it is knowing which question a given field can answer.
The Fields That Carry Decisions
| Field group | Contents | Decisions it supports |
|---|---|---|
| Identification | Extension, device, trunk, call direction | Which routes and endpoints carry which traffic |
| Timing | Start time, duration, ring time, talk time | Staffing levels, queue performance, peak periods |
| Outcome | Completed, busy, no answer, failed, cancelled | Service performance and routing effectiveness |
| Party | Calling number, called number, presentation status | Cost attribution and campaign or department tracking |
| Cost | Trunk, rate class, call cost | Cost allocation by department or site |
| Quality | Codec, packet loss, jitter, mean opinion score | Voice quality problems and their location |
| Path | Recording reference, call flow steps | Verification and dispute resolution |
Questions the Data Answers Well
- Which trunk or site generates the most cost? — Cost by trunk over time, with rate class breakdown
- Where are calls failing? — Failure reasons by site, device class, or trunk
- What are the real peak hours? — Call volume by hour, weighted by attempt rather than by unique callers
- Which ring groups need staffing? — Answer rate and wait time by group and by hour
- Is voice quality degrading anywhere? — Packet loss and jitter trends by site and trunk
- Did a specific call happen, and was it recorded? — Search by party, date, and direction, with recording reference
Questions the Data Answers Poorly
Some questions look answerable and are not. Individual performance ranking is the clearest example: call duration does not reflect contribution, and ranking by duration produces incentives that damage service. Similarly, cost per call is misleading when call mix differs between departments, and abandoned call rate cannot be interpreted without the queue volume and the time of day it was measured.
Practical Reporting Practice
- Define the question first — Then choose the fields and period that answer it, rather than reporting everything
- Aggregate before publishing — Individual records are verification data; management decisions need aggregates
- Keep the comparison basis stable — Changing the period or the population makes trends meaningless
- Annotate the timeline — Mark carrier changes, migrations, and incidents so anomalies are explainable
- Retain the raw records — Aggregates lose the detail needed for verification, within your retention policy
Retention and Privacy
Call detail records contain party identification, so they carry the same privacy obligations as recorded audio. Apply a defined retention period, restrict access to the recording store and the detail records consistently, and make sure both expire together. Records retained indefinitely because no one set a policy become a liability well before they become a burden.
Getting the Data Out
Most platforms can export detail records on a schedule. Where the analysis needs to go further than the platform's own reports, a scheduled export into a spreadsheet or database allows the same questions to be asked over longer periods and combined with other business data. The export schedule should match the retention period, so the two do not diverge.
Redstone Systems, Inc. founded in Delaware, USA in December 2002, has been the ODM vendor for many well-known communications companies, serving the Southeast Asian market. In 2020, Redstone Systems will begin to return to the North America market with its self-developed brand.
Redstone has a complete product line of intelligent voice gateways, providing IP-PBXs, analog VoIP gateways (FXS/FXO), digital VoIP gateways (E1/T1), border appliances, and session boundary controllers (SBCs).
With advanced technology in digital signal processor (DSP), speech coding and speech processing, as well as efficient operational tools such as cloud remote management, auto provisioning, Redstone gateways are widely used in markets of enterprise communications, cloud communications, call centers, operators’ IMS/SIP trunks, bringing users friendly, efficient and reliable communication experience.
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