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Call Accounting: Charging Voice Spend Back to the Departments That Cause It
In most organisations the telephone bill arrives as one number, is approved by one person, and is allocated to overhead. Nobody knows which department's international calls produced it, so nobody has any reason to change behaviour. Call accounting exists to fix that, and it fails whenever it is run as an audit rather than as a management report.
What You Can and Cannot Allocate
Call detail records give you origin extension, destination, duration, and time. That is enough to allocate outbound toll cost with reasonable fairness. It is not enough to allocate trunk rental, licence fees, or support contracts, which are driven by capacity and headcount rather than by individual calls. A good scheme separates the two: usage-based cost follows the calls, and fixed cost follows a simple driver such as extension count.
| Cost type | Sensible driver | Why |
|---|---|---|
| Outbound toll and international | Actual call records | Directly caused by the caller |
| Trunk and channel rental | Peak concurrent usage | Capacity bought for busy periods |
| Platform and licensing | Extension count | Scales with people, not minutes |
| Handset and support | Device count | Follows hardware population |
| Recording storage | Retention policy per team | Driven by policy choices |
Simplicity Beats Precision
A scheme that is ninety per cent fair and understood by managers changes behaviour. A scheme that is ninety-nine per cent fair and incomprehensible is argued with and then ignored. The practical approach is a small number of categories, a fixed monthly cadence, and one page per department. If a manager cannot see, in one screen, what they spent and what changed since last month, the report will not be read.
- Map every extension to a department and keep the map current
- Separate usage cost from fixed cost and allocate each differently
- Publish one page per department, monthly, on a fixed date
- Show the change from last month, not just the total
- Define a dispute window and a named person who resolves it
- Flag anomalies privately before they appear in a report
The Extension Map Is the Whole System
Every allocation depends on knowing which extension belongs to which department. That map decays with every starter, leaver, and reorganisation. Where the platform can hold department attributes on the extension itself, the report stays correct without a spreadsheet. Where it cannot, the spreadsheet needs an owner and a monthly reconciliation against the actual extension list, or the reports will quietly allocate this year's calls to last year's structure.
Handling the Awkward Cases
Shared extensions, conference bridges, and reception numbers do not belong to one person and should not be allocated to one. Give them a named cost centre, usually the team that owns the service, and treat them as infrastructure. Similarly, a single very large international call is better handled as a conversation than as a line item, because by the time it reaches a report the behaviour has already happened.
Redstone Approach
Redstone IP-PBX platforms produce call detail records with extension, trunk, destination, duration, and disposition, exportable for accounting systems. Deployments include tagging extensions with department and cost centre attributes so reports stay accurate as staff move.
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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