Telecom scale is not simply about handling more calls. It is about processing growing traffic volumes while keeping routing precise, billing accurate, operations automated and network performance predictable.
For wholesale VoIP operators the challenge becomes sharper as customers, carriers, destinations and transaction volumes multiply. A platform that works for a small deployment can become an operational bottleneck when every additional customer introduces new routes, rate decks, billing rules and monitoring requirements. Class 4 Fusion addresses this challenge by bringing switching, routing, billing, monitoring, reporting, portals and automation into one operating environment. DeNoVoLab currently positions Class 4 Fusion as an all-in-one platform for termination and origination traffic with high-volume switching capabilities and a published 42k CPS figure. (DeNoVoLab)
Large-Scale Telecom Operations Require More Than High Call Capacity
Scale is a systems problem
When a telecom operator grows from thousands of calls to millions of calls the challenge is not limited to processing SIP sessions.
The business also has to manage:
More customer accounts
More carrier relationships
Larger rate decks
More routing rules
More CDR records
Higher billing volumes
More concurrent traffic
Greater fraud exposure
More operational exceptions
This creates a useful distinction:
Call-processing scale asks how much traffic the network can handle.
Operational scale asks how efficiently the business can manage everything surrounding that traffic.
A platform can perform well technically while still becoming difficult to operate.
One operating platform reduces fragmentation
DeNoVoLab describes Class 4 Fusion as a platform that combines switching routing billing monitoring reporting backup and operator workflows. Its architecture is designed around shared operational data rather than treating each function as an isolated system. (DeNoVoLab)
Think of it like an airport.
Handling more aircraft is only one requirement. The airport also needs baggage management, gates, security, scheduling and passenger information to expand alongside aircraft movements.
Telecom infrastructure works similarly.
More calls require more than more switching capacity.
They require a stronger operating model around the traffic.
High-Throughput Switching Creates the Foundation for Growth
CPS matters when traffic arrives at scale
Calls do not arrive at a perfectly steady pace.
Traffic can surge during business hours, campaigns, seasonal events or customer-specific peaks.
That makes Calls Per Second or CPS an important capacity metric for carrier infrastructure.
DeNoVoLab currently publishes 42k CPS for Class 4 Fusion and describes its switch core as designed for high-volume carrier traffic. Its product page also states that the platform can terminate tens of thousands of CPS on a dual-server deployment. (DeNoVoLab)
The published figure should be treated as a platform specification rather than a universal deployment guarantee. Actual capacity depends on server resources, call profiles, routing complexity, media handling and deployment architecture.
Concurrent calls tell another part of the story
CPS measures the rate at which calls are established.
Concurrent sessions indicate how many calls are active at a given time.
These metrics answer different questions.
For example:
A network may experience a sudden burst of 1,000 call attempts per second but relatively short call durations.
Another network may establish calls more slowly but maintain hundreds of thousands of active sessions because conversations last longer.
Carrier-grade planning therefore needs to consider both traffic arrival rate and active session volume.
Capacity planning should include headroom
Suppose a network normally operates at 60% of its practical capacity.
That remaining 40% provides room for unexpected traffic spikes maintenance activities or temporary carrier rerouting.
Running infrastructure permanently near its ceiling is similar to operating a highway with every lane occupied.
One minor disruption can create disproportionate congestion.
Large-scale telecom operations need capacity not only for average traffic but also for peak traffic and failure scenarios.
Intelligent Routing Keeps Large Traffic Volumes Economically Manageable
More carriers create more routing complexity
A growing wholesale operator rarely works with one carrier.
It may have multiple suppliers for the same destination based on:
Price
Quality
Availability
Capacity
Customer requirements
Time of day
Route preference
Geographic conditions
As the number of carriers grows manual route management becomes increasingly difficult.
DeNoVoLab's current Class 4 Fusion offering includes LCR and prefix rules alongside trunk groups, failover and margin-aware control. It also supports A-Z traffic, US jurisdiction traffic and origination workflows. (DeNoVoLab)
Lowest cost does not always mean best route
Consider two carriers:
Carrier A: $0.0040/minute Carrier B: $0.0045/minute
Carrier A appears to offer the better economics.
But suppose Carrier A has inconsistent performance while Carrier B provides more stable completion.
At 10 million minutes the nominal difference is:
10,000,000 × $0.0005 = $5,000
That $5,000 saving may not remain attractive if Carrier A creates higher failure rates, customer complaints or additional routing intervention.
This is why large-scale routing should consider cost and operational performance together.
Routing becomes more valuable as traffic grows
Imagine an operator improves average termination economics by only $0.0002 per minute.
At 1 million minutes that equals $200.
At 100 million minutes it becomes $20,000.
At 500 million minutes it becomes $100,000.
The individual optimization is tiny.
The scale effect is not.
This is one reason routing intelligence becomes a strategic asset as wholesale traffic grows.
Billing and CDR Management Become Critical at Scale
Every call creates commercial data
A large telecom network produces enormous quantities of call records.
Each call can contribute information about:
Customer
Carrier
Destination
Start time
Duration
Cost
Revenue
Route
Billing status
At low volume these records can be relatively easy to manage.
At large volume they become a data-management challenge.
DeNoVoLab describes Class 4 Fusion as integrating CDR generation and storage with its switching routing billing and reporting functions. Its architecture documentation also describes a database designed for high-volume CDR traffic with hybrid local and cloud storage options. (DeNoVoLab)
The economics of small billing errors grow quickly
Consider an operator processing 100 million minutes per month.
A billing discrepancy of only:
$0.0001 per minute
represents:
$10,000
That is why billing accuracy becomes increasingly important as traffic scales.
A fraction of a cent may look insignificant on one call.
Across hundreds of millions of minutes it becomes a material financial figure.
Shared data reduces reconciliation work
DeNoVoLab's architecture describes a data-centric approach in which finance network and routing operations work from the same underlying data. It gives the example of billing status affecting service availability without requiring separate system integration. (DeNoVoLab)
That is particularly relevant for large operations.
Instead of asking:
"Which system has the latest information?"
teams can work from a common operational foundation.
Automation Lets Operations Grow Without Matching Headcount Growth
Manual processes become the hidden bottleneck
A network can process millions of calls automatically while employees still manually manage rate decks invoices route tests and reports.
That creates an unusual situation:
The network scales faster than the operation.
DeNoVoLab highlights automated rate generation, rate delivery, route testing and rate import within its Class 4 Fusion architecture. Its current product page also highlights automated rate generation, fraud blocking, archive automation, reporting and invoicing. (DeNoVoLab)
Example: rate management at scale
Imagine an operator works with 100 carriers.
Each carrier maintains rates across thousands of destinations.
A manual process could require employees to:
Receive rate files
Validate them
Identify changes
Import the data
Generate customer rates
Apply margins
Deliver updated rates
Verify routing impact
Now multiply the process by 100 suppliers.
The difficulty is no longer the complexity of one rate deck.
It is the frequency and repetition of the workflow.
Automation converts a recurring manual procedure into a repeatable system process.
Automation creates operating leverage
Suppose a task requires 20 employee-hours per week.
That is approximately 1,040 hours per year.
If automation reduces the repetitive portion by 75% then approximately 780 hours can potentially be redirected toward exception handling analysis and higher-value work.
The numbers are illustrative rather than a guaranteed savings estimate.
The underlying business principle is important:
Large-scale telecom infrastructure should automate repetition so people can concentrate on decisions.
Monitoring and Fraud Controls Protect Large Traffic Flows
More traffic also means more exposure
Growth increases opportunity.
It also increases risk.
A large VoIP operator can become exposed to:
Fraudulent traffic
Unusual traffic spikes
Carrier degradation
Route failures
Capacity exhaustion
Abnormal customer behavior
DeNoVoLab's current Class 4 Fusion platform includes monitoring and fraud controls alongside CAP and channel limits. Its product information also describes real-time operational control and automated fraud blocking. (DeNoVoLab)
Monitoring needs to become actionable
A dashboard that simply shows thousands of metrics is not enough.
Operators need to understand:
What changed?
Which customer is affected?
Which carrier is involved?
Which destination is behaving differently?
What should happen next?
This is where integrated monitoring becomes valuable.
For example:
A customer's normal traffic is 50,000 minutes per day.
The platform detects 300,000 minutes during an unusual period.
That does not automatically prove fraud.
But it creates an immediate signal for investigation.
Capacity controls protect legitimate traffic
Suppose one customer suddenly consumes most of a trunk's available channels.
Even if the traffic is legitimate it may affect other customers.
CAP and channel controls can therefore serve both operational and commercial purposes.
They establish boundaries around resource consumption.
This is particularly important in shared wholesale environments where one customer's behavior can influence the experience of others.
Distributed Architecture Supports Resilience at Scale
Large networks should not depend on one processing point
As traffic increases the consequences of infrastructure failure also increase.
If one switching instance handles 5,000 calls then an outage affects one segment of traffic.
If that same instance handles a much larger share of the network then the impact can be substantially greater.
DeNoVoLab's architecture documentation describes Class 4 Fusion as distributed across multiple switching and routing instances that can operate within the same facility or across separate facilities. (DeNoVoLab)
That creates options for:
Load distribution
Capacity expansion
Redundancy
Maintenance
Geographic separation
Redundancy should be part of the original design
High availability should not be treated as something added only after a major outage.
It should be considered when the network is first designed.
Imagine a carrier platform that routes traffic through one switching node.
Maintenance requires taking that node offline.
Without redundancy the operator may need to interrupt service.
With multiple processing instances traffic can potentially be distributed according to the deployment architecture.
That is the difference between resilience by design and resilience by emergency procedure.
Geographic distribution can strengthen continuity
Running infrastructure across separate locations can also reduce dependence on one facility.
DeNoVoLab's architecture describes deployment across the same colocation facility or separate facilities. (DeNoVoLab)
This can be relevant when operators need stronger protection against facility-level outages.
Class 4 Fusion Compared With Other Large-Scale Telecom Platforms
DeNoVoLab focuses on the integrated Class 4 operating model
Class 4 Fusion is positioned as an all-in-one platform for wholesale voice operations.
Its current product information brings together:
Switching + Routing + Billing + Monitoring + Reporting + Portals + Automation
It supports termination and origination traffic and provides a free Community Edition with 500 ports for live-traffic evaluation. The commercial model currently lists a $0.50 monthly port license and $0.0003 per-minute usage rate beyond the free Community Edition. (DeNoVoLab)
For operators evaluating large-scale infrastructure the important proposition is not simply capacity.
It is the ability to operate several core functions through one platform.
PortaSwitch takes a broader converged telecom approach
PortaOne's current PortaSwitch documentation describes the platform as a unified system for telecom service providers, wholesale carriers, ISPs, MVNOs and NGN operators.
Its architecture includes PortaBilling for real-time converged billing and service provisioning and PortaSIP as a Class 4 and Class 5 SIP softswitch with media functionality. (PortaOne Documentation)
PortaOne also documents an architecture where additional processing nodes can be added based on required processing capacity. Its current documentation states that the number of processing nodes is virtually unlimited and depends on the required total processing capacity. (PortaOne Documentation)
This makes PortaSwitch particularly relevant for operators seeking a broader service-provider platform rather than a Class 4-focused operating model.
TelcoBridges emphasizes carrier-grade SBC infrastructure
TelcoBridges ProSBC takes a different architectural position.
Its current product information states that ProSBC can handle up to 1,000 call attempts per second and 60,000 concurrent sessions while supporting high-availability clustering. It also provides MOS scoring, call tracing and network-security features. (TelcoBridges)
The platform can run on VMware, KVM/Proxmox, AWS, Azure and bare-metal environments. (TelcoBridges)
That makes ProSBC particularly relevant when the primary requirement is a secure and scalable SBC or voice-network edge.
The comparison is therefore about architecture rather than a simple feature count:
DeNoVoLab Class 4 Fusion: integrated Class 4 switching, routing, billing, monitoring and operator workflows.
PortaSwitch: broader converged telecom platform covering Class 4/Class 5 services, billing and service provisioning.
TelcoBridges ProSBC: carrier-grade SBC focused on secure voice connectivity, interoperability, routing and high-volume session handling.
The appropriate choice depends on the operator's business model and technical priorities.
What Large-Scale Operators Should Measure
Large-scale infrastructure decisions should be based on measurable outcomes rather than feature lists alone.
Traffic capacity: Track CPS and concurrent sessions under normal and peak conditions.
Route performance: Measure carrier quality alongside termination costs.
Billing accuracy: Compare customer charges with supplier costs and CDR records.
Automation coverage: Identify which operational processes still require repetitive human intervention.
Infrastructure utilization: Monitor CPU, memory, network bandwidth, storage and trunk capacity.
Security events: Track fraud attempts, unusual traffic patterns and account anomalies.
Failover performance: Test whether traffic can move to alternative processing or carrier paths when required.
Operational efficiency: Measure how much employee time is spent managing routine network processes.
These metrics turn infrastructure from a technical expense into a measurable business asset.
Building a Large-Scale Telecom Operation With Class 4 Fusion
A practical deployment strategy can be thought of in stages.
Stage 1: Establish the core
Deploy switching, routing and billing and validate customer and carrier workflows.
Stage 2: Automate repetitive processes
Introduce automated rate management, route testing, reporting and invoicing.
Stage 3: Expand traffic
Add customers and carriers while monitoring CPS, concurrent sessions and trunk utilization.
Stage 4: Strengthen resilience
Introduce additional switching and routing instances and appropriate failover architecture.
Stage 5: Optimize commercially
Use traffic and billing data to evaluate customer profitability, carrier economics and route performance.
Stage 6: Refine operations
Use monitoring and automation to reduce manual intervention and focus teams on exceptions.
This staged approach avoids treating scale as one enormous infrastructure project.
Instead it creates a path where capacity, automation and operational maturity develop together.
Conclusion: Large-Scale Telecom Requires an Operating System for Traffic
Large telecom operations are not defined by call volume alone.
They are defined by how effectively the business manages everything surrounding that volume.
Switching must process traffic.
Routing must select appropriate paths.
Billing must capture revenue accurately.
CDRs must remain accessible.
Monitoring must reveal changes.
Fraud controls must protect resources.
Automation must eliminate unnecessary repetition.
And the architecture must remain resilient as traffic increases.
DeNoVoLab Class 4 Fusion is designed around this integrated model. Its current platform combines switching, routing, billing, monitoring, reporting, portals and automation and supports termination and origination workflows. It publishes a 42k CPS platform figure and provides a 500-port Community Edition for live-traffic evaluation. (DeNoVoLab)
PortaSwitch provides a broader converged telecom platform with real-time billing and service provisioning through PortaBilling alongside Class 4 and Class 5 switching through PortaSIP. Its current architecture supports additional processing nodes based on capacity requirements and multi-site deployments. (PortaOne Documentation)
TelcoBridges ProSBC offers another model centered on the carrier-grade SBC with up to 60,000 concurrent sessions, up to 1,000 call attempts per second and high-availability clustering. (TelcoBridges)
The strategic lesson is straightforward:
Scaling telecom operations successfully means scaling the entire operating model rather than simply increasing call capacity.
A platform becomes increasingly valuable when it can handle more traffic while keeping the surrounding processes controlled.
That is where Class 4 Fusion can fit into a large-scale wholesale VoIP strategy.
It provides a foundation where network traffic, routing decisions, billing events, carrier relationships and operational workflows can exist within one connected environment.
For operators planning the next stage of growth the question should therefore not be:
"How many calls can our switch handle?"
It should be:
"How efficiently can our entire telecom operation grow when those calls become millions or billions of minutes?"
Ready to scale your telecom operation?
Explore DeNoVoLab Class 4 Fusion and evaluate how integrated switching, routing, billing, monitoring and automation can support high-volume wholesale VoIP operations.
0 Comments