Multi-vendor routing turns that complexity into an advantage when the network can intelligently decide which carrier should handle each call. With the right Class 4 infrastructure operators can combine carrier pricing, route quality, capacity, failover and business rules to improve network resilience while protecting margins. DeNoVoLab positions Class 4 Fusion as an integrated platform for termination and origination traffic with switching, routing, billing, monitoring, reporting and automation in one operating environment. Its current routing capabilities include LCR and prefix rules, trunk groups and failover and margin-aware control. (denovolab.com)
This guide explores how multi-vendor routing with Class 4 Fusion can be structured and why the strategy matters for modern wholesale VoIP operators.
Why Multi-Vendor Routing Matters in Wholesale VoIP
One carrier creates dependency
Relying on a single termination provider can simplify operations.
It can also create a significant concentration risk.
If that carrier experiences an outage, congestion or route-quality deterioration then the operator may have limited alternatives.
A multi-vendor model changes the equation.
Instead of:
Customer → One carrier → Destination
the network can operate more like:
Customer → Class 4 switch → Carrier A / Carrier B / Carrier C / Carrier D → Destination
The Class 4 platform becomes the decision point that determines where traffic should go.
PortaOne's current documentation makes the same fundamental point in its routing guidance: having only one termination partner creates a dependency and multiple vendors can provide alternative routes when a preferred connection fails. (PortaOne Documentation)
More carriers create more options
Suppose an operator has five carriers serving the same destination.
Each carrier may differ in:
Price
ASR
ACD
Capacity
Availability
Geographic coverage
Technical compatibility
Commercial terms
That gives the operator more than five suppliers.
It creates a portfolio of routing possibilities.
The challenge is deciding how to use them efficiently.
Multi-vendor routing is like portfolio management
A financial portfolio does not necessarily put every investment into one asset.
Likewise a resilient voice network does not necessarily send all traffic through one carrier.
The objective is not to distribute traffic randomly.
It is to allocate traffic according to defined commercial and technical objectives.
Build a Routing Hierarchy Around Multiple Vendors
Start with a preferred route
A multi-vendor strategy needs structure.
For a particular destination the operator might configure:
Primary → Secondary → Tertiary → Emergency
For example:
Carrier A: preferred route Carrier B: secondary route Carrier C: quality backup Carrier D: emergency fallback
This creates a clear route hierarchy.
DeNoVoLab's Class 4 Fusion currently supports trunk groups and failover alongside LCR and prefix rules. (denovolab.com)
Do not confuse routing diversity with random distribution
Sending 25% of traffic to four carriers does not automatically create an intelligent multi-vendor strategy.
Traffic should be distributed according to a reason.
For example:
Carrier A may have the best cost
Carrier B may have the strongest quality
Carrier C may provide additional capacity
Carrier D may be reserved for failover
This creates purposeful diversity.
Different destinations may need different vendor strategies
A carrier that performs exceptionally well for the United Kingdom may not be the best option for India or Brazil.
Therefore routing policies should be destination-aware.
A practical configuration could look like:
UK: A → B → C India: B → D → A Brazil: C → A → D US: A → C → B
The exact ordering should be based on actual route economics and performance data.
Combine LCR With Quality-Based Routing
Least Cost Routing is only the starting point
LCR is one of the most important tools in wholesale VoIP.
The basic principle is simple:
Choose the eligible carrier offering the lowest applicable cost.
PortaOne's documentation describes LCR as arranging available routes from the lowest to the highest price. It also supports routing plans that can override normal LCR ordering when an operator wants specific vendor priorities. (PortaOne Documentation)
But cost alone does not tell the whole story.
Cheapest can become expensive
Imagine:
Carrier A: $0.0040/minute Carrier B: $0.0044/minute
Carrier A appears to be the obvious choice.
Now assume Carrier A has substantially weaker call completion.
If customers repeatedly need to retry calls then the commercial impact can extend beyond the carrier's advertised rate.
At 10 million minutes the direct cost difference is:
10,000,000 × $0.0004 = $4,000
That $4,000 may be worth paying if the alternative produces materially better operational performance.
This is why route economics should consider both cost and outcome.
Class 4 Fusion supports multiple routing models
DeNoVoLab currently lists LCR, QoS, percentage, round robin, top-down, priority, time-based and capacity constraint routing among its routing capabilities. (denovolab.com)
This provides more flexibility than relying exclusively on a single routing methodology.
For example:
LCR for cost optimization.
QoS routing for performance-sensitive traffic.
Percentage routing for controlled traffic distribution.
Priority routing for preferred carriers.
Capacity routing when carrier resources are constrained.
The operator can select the method according to the business requirement.
Use Carrier Performance Data to Make Better Routing Decisions
Rate decks tell you what a carrier charges
They do not tell you how the route behaves under production traffic.
That requires operational data.
Useful indicators include:
ASR
ACD
Call failure rates
SIP response patterns
CPS capacity
Concurrent sessions
Destination coverage
Route availability
The more vendors an operator has the more important this information becomes.
Example: Three-carrier comparison
Consider a hypothetical destination with three suppliers.
Carrier A Low cost Strong ASR Moderate capacity
Carrier B Medium cost Excellent ASR High capacity
Carrier C High cost Strong quality Limited capacity
A static LCR strategy will tend to favor Carrier A.
A more sophisticated strategy may use Carrier A for normal traffic then shift traffic toward Carrier B when Carrier A approaches its capacity or performance threshold.
Carrier C can remain available as a resilience layer.
This is the real advantage of multi-vendor infrastructure.
The operator does not have to treat every carrier identically.
Routing should learn from network behavior
A carrier that performed well last month may not perform identically today.
Traffic patterns change.
Carrier capacity changes.
Commercial rates change.
Network conditions change.
Therefore routing strategies should be supported by current operational data rather than relying permanently on historical assumptions.
Multi-Vendor Routing Creates Stronger Failover
Failure should trigger a routing decision
Suppose Carrier A becomes unavailable.
Without a backup:
Customer → Carrier A → Failure
With multi-vendor routing:
Customer → Carrier A → Failure → Carrier B → Call continues
This is the basic value of failover.
DeNoVoLab's current Class 4 Fusion feature set includes trunk groups and failover. (denovolab.com)
PortaOne similarly documents automatic advancement to the next route when a previous vendor route fails. (PortaOne Documentation)
TelcoBridges ProSBC also supports multi-route configurations where traffic can automatically advance when a primary terminator is unavailable or congested. (TelcoBridges)
Failover should be layered
A resilient configuration might look like:
Primary: lowest-cost qualified carrier
Secondary: preferred quality carrier
Tertiary: alternate geographic carrier
Emergency: higher-cost route
This approach prevents the operator from depending on a single backup.
Hard failure is not the only failure
A carrier can remain technically online while its performance deteriorates.
Examples include:
Rising call failures
Reduced ASR
Increased latency
Capacity pressure
Abnormal SIP responses
A sophisticated routing strategy should therefore distinguish between availability and usable performance.
The goal is not merely to find a carrier that responds.
It is to find a carrier that can deliver the expected service.
Use Capacity-Aware and Percentage Routing
Not every carrier can absorb unlimited traffic
Suppose Carrier A can comfortably support 1,000 CPS.
Carrier B can support 500 CPS.
Carrier C can support 250 CPS.
A simple percentage model that sends 40% of traffic to each carrier could overload Carrier C during peak periods.
Capacity therefore needs to become part of routing policy.
DeNoVoLab currently lists capacity constraint routing and describes controls around carrier, IP and trunk-level capacity. (denovolab.com)
Percentage routing is valuable for controlled distribution
Percentage routing can be useful when the operator wants to:
Test a new carrier
Gradually increase traffic
Maintain vendor balance
Control exposure
Compare route performance
For example:
Carrier A: 60%
Carrier B: 25%
Carrier C: 15%
This can be changed as performance data develops.
Use controlled migration instead of a sudden switch
Suppose Carrier B offers a new route that appears commercially attractive.
Instead of moving 100% of traffic immediately the operator could begin with a small allocation.
For example:
Phase 1: 5%
Phase 2: 15%
Phase 3: 30%
Phase 4: broader deployment if performance remains acceptable
This resembles a software deployment strategy.
You do not necessarily push an untested release to every user simultaneously.
The same logic can apply to carrier routing.
Connect Multi-Vendor Routing With Billing and Margin Management
Routing decisions have direct financial consequences
Every carrier selection affects cost.
Every customer route affects revenue.
The difference affects margin.
Therefore routing should not be isolated from billing.
DeNoVoLab's Class 4 Fusion combines routing with rate decks, invoices, customer and vendor billing and balance and credit controls. (denovolab.com)
This creates a connected operating model.
Consider a simple margin calculation
A customer is billed:
$0.0090/minute
Carrier A costs:
$0.0045/minute
Nominal gross margin:
$0.0045/minute
Carrier B costs:
$0.0050/minute
Nominal gross margin:
$0.0040/minute
At 20 million minutes the difference is:
20,000,000 × $0.0005 = $10,000
That is why small routing differences matter at wholesale scale.
Margin-aware routing adds another dimension
The lowest carrier rate does not automatically guarantee the best commercial result.
The operator should consider:
Customer rate
Carrier cost
Route quality
Expected traffic
Capacity
Commercial commitments
DeNoVoLab specifically lists margin-aware control alongside LCR and prefix rules in Class 4 Fusion. (denovolab.com)
This allows routing to be considered within a broader commercial strategy.
Automate Multi-Vendor Rate and Routing Operations
More vendors mean more rate changes
Suppose an operator has:
50 vendors × 5,000 destination rates
That creates potentially 250,000 rate entries before considering customer-specific pricing.
Now imagine those vendors periodically update their rates.
Manual processing becomes difficult to sustain.
This is where automation becomes an operational requirement rather than a convenience.
DeNoVoLab's current platform combines rate generation and routing with its broader billing and operator workflows. Its published product information also describes automated rate generation and rate-related workflows. (denovolab.com)
Automate the repetitive parts
A scalable workflow can include:
Vendor rate received → validation → import → margin application → customer rate generation → routing update → notification
Human oversight can remain where it adds value.
For example an operator may want approval before a major rate change reaches production.
The goal is to automate repetition while preserving control.
Route testing should be part of the process
Before giving a new carrier significant traffic the operator can test:
Call completion
ASR
ACD
SIP response behavior
Capacity
Destination coverage
This turns a new vendor from an untested possibility into a measurable routing candidate.
Multi-Vendor Routing and the Broader Class 4 Architecture
Routing works best when connected to switching
The switch receives the call.
The routing engine determines the path.
The selected carrier receives the traffic.
The resulting CDR feeds billing and reporting.
Monitoring evaluates the outcome.
This creates a feedback loop.
Traffic → Routing → Carrier → CDR → Analysis → Better Routing
That is considerably more useful than treating routing as an isolated configuration table.
DeNoVoLab positions Class 4 Fusion around this integrated model by combining switching, routing, billing, monitoring, reporting, portals and automation in one platform. (denovolab.com)
CDRs provide the evidence
CDRs can help operators understand:
Which carrier handled a call
How long the call lasted
What destination was reached
What traffic volume was generated
What billing result occurred
That data can then inform carrier evaluation.
A vendor that consistently produces strong economics and quality can receive more traffic.
A vendor with deteriorating performance can be moved down the routing hierarchy.
This creates a data-driven partner allocation model.
Class 4 Fusion vs Other Multi-Vendor Routing Approaches
DeNoVoLab Class 4 Fusion
DeNoVoLab's approach combines multi-vendor routing with a broader Class 4 business platform.
Current published capabilities include:
LCR and prefix rules
Trunk groups
Failover
Margin-aware routing
QoS routing
Percentage routing
Priority routing
Time-based routing
Capacity constraint routing
Switching
Billing
Monitoring
Vendor portals
Customer portals
Reporting
Automation (denovolab.com)
The differentiator is not simply that multiple carriers can be configured.
It is that routing sits inside the wider wholesale operating workflow.
PortaOne PortaSwitch
PortaOne provides a mature multi-vendor routing model through PortaSwitch.
Its current documentation describes routing plans that control which vendors are used for termination and the order in which route categories are tried. LCR can be overridden when an operator wants a specific route sequence. (PortaOne Documentation)
PortaOne also documents automatic route advancement when a previous carrier route fails. (PortaOne Documentation)
This makes PortaSwitch a strong comparison for operators evaluating broader converged telecom platforms.
Its approach is particularly relevant when routing is part of a larger billing and service-provider ecosystem.
TelcoBridges ProSBC
TelcoBridges takes a more SBC-centric approach.
ProSBC supports multiple carriers through Network Access Points and provides intelligent routing and automatic failover. Its current product information lists up to 1,024 NAPs, 60,000 concurrent sessions and 350,000 SIP endpoint registrations per server. (TelcoBridges)
Its documentation also emphasizes rule-based routing, priority and quality-based decisions in multi-carrier environments. (TelcoBridges)
The distinction is architectural:
DeNoVoLab Class 4 Fusion: integrated wholesale switching, routing, billing and operational management.
PortaOne PortaSwitch: broader converged telecom platform with sophisticated vendor routing and billing.
TelcoBridges ProSBC: carrier-edge SBC focused on routing, interoperability, security and high availability.
The right choice depends on whether the operator primarily needs an integrated wholesale Class 4 platform or a broader telecom environment or a specialized carrier-edge routing layer.
A Practical Multi-Vendor Routing Framework
Step 1: Build a vendor inventory
Document every carrier by:
Destination coverage
Rates
Capacity
Quality
Commercial terms
Technical requirements
Step 2: Establish route categories
Create categories such as:
Preferred
Cost optimized
Quality optimized
Backup
Emergency
This creates a logical routing hierarchy.
Step 3: Define measurable thresholds
Determine acceptable levels for:
ASR
ACD
CPS
Capacity
Call failure
Cost
Margin
Step 4: Configure failover
Every important route should have a defined alternative.
Do not wait for an outage to decide which carrier should receive the traffic next.
Step 5: Introduce percentage routing carefully
Use controlled allocations when testing or balancing new vendors.
Step 6: Monitor continuously
Compare carriers against one another rather than evaluating each carrier in isolation.
Step 7: Review commercial performance
Evaluate cost alongside revenue and margin.
Step 8: Automate repetitive processes
Rate imports, rate generation, route testing and reporting are strong candidates for automation.
Step 9: Rebalance traffic
Strong performance should create opportunities for increased traffic.
Poor performance should trigger investigation or reduced allocation.
Step 10: Maintain human governance
Automation should operate within clear business policies.
That is what makes the routing strategy scalable without making it uncontrolled.
Conclusion: Multi-Vendor Routing Turns Carrier Diversity Into a Competitive Advantage
A large carrier network does not automatically create a better wholesale VoIP business.
The advantage comes from knowing how to use those carriers intelligently.
Multi-vendor routing gives operators the flexibility to combine different suppliers according to price, quality, capacity and availability. LCR can help control termination costs. Quality-based routing can help favor stronger-performing paths. Percentage routing can support controlled traffic allocation. Capacity routing can prevent overloaded carriers. Failover can protect continuity when preferred routes fail.
The real value emerges when these capabilities work together.
DeNoVoLab Class 4 Fusion brings switching, routing, billing, monitoring, reporting and automation into one operating environment. Its current routing capabilities include LCR and prefix rules, trunk groups and failover and margin-aware control alongside QoS, percentage, priority, time-based and capacity constraint routing. (denovolab.com)
PortaOne offers another established approach through PortaSwitch routing plans and LCR with configurable vendor ordering and automatic route advancement. (PortaOne Documentation) TelcoBridges ProSBC approaches the problem from the carrier-edge perspective with multi-carrier routing, failover and high-availability capabilities. (TelcoBridges)
The strategic objective is the same regardless of platform:
Do not let your carrier portfolio become a source of complexity. Turn it into a source of resilience, flexibility and commercial advantage.
For wholesale operators processing millions of minutes the economics can be significant. A difference of a fraction of a cent per minute can translate into thousands of dollars at scale while a single carrier outage can affect customer experience and revenue.
The strongest multi-vendor strategy therefore balances four priorities:
Cost | Quality | Capacity | Continuity
When those variables are managed through intelligent routing and connected to billing and network monitoring the carrier ecosystem becomes much easier to control.
Ready to make your multi-carrier network more intelligent?
Explore DeNoVoLab Class 4 Fusion and evaluate an integrated Class 4 platform for multi-vendor routing, switching, billing, monitoring and automation.
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