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NexGenVoice is a trusted wholesale VoIP provider delivering premium voice termination services with high ASR, low PDD, and direct Tier-1 routes. Get reliable A-Z VoIP termination for telecom operators, carriers, and resellers worldwide.
Enterprise-grade solutions for modern businesses
Our wholesale VoIP services deliver carrier-grade voice termination with A-Z routes, real-time routing, fraud protection, and scalable telecom infrastructure for VoIP providers and wholesale carriers.
Terminate calls to 200+ countries and territories using direct Tier-1 routes for the highest possible call quality, lowest latency, and maximum reliability across every destination in your traffic mix.
Our optimised routing delivers industry-leading Answer-Seizure Ratios (ASR) and Average Call Duration (ACD) metrics that directly maximise your revenue per minute and improve end-customer satisfaction.
Access some of the most competitive wholesale voice rates in the industry. Volume-based pricing with tiered discounts ensures your per-minute costs decrease as your traffic grows — rewarding business expansion.
Full support for SIP, H.323, and IAX2 protocols ensures seamless interoperability with all major softswitches including Kamailio, OpenSIPS, FreeSWITCH, Asterisk, and proprietary carrier-grade platforms.
Monitor your traffic volumes, ASR, ACD, PDD, and costs in real time through our advanced wholesale portal. API access enables automated integration with your existing billing, monitoring, and provisioning systems.
Multi-layered fraud detection engine analyses traffic patterns in real time to identify and block TDoS attacks, PBX hacking, premium-rate fraud, and revenue leakage — protecting your margins and your customers 24/7.
Our Network Operations Centre is staffed around the clock by experienced VoIP engineers who proactively monitor routes, respond to quality degradation within minutes, and coordinate carrier escalations on your behalf.
Detailed call detail records generated in real time with support for custom billing intervals, rounding rules, and export formats. Integrate with your billing platform via API or automated SFTP delivery for seamless reconciliation.
Dynamic LCR engine continuously evaluates route quality, cost, and availability to automatically select the optimal path for every call — balancing price and performance without manual intervention or static route configurations.
Getting up and running with NexGenVoice Wholesale VoIP is fast, simple, and fully supported by our NOC team — from initial traffic profiling to live production traffic in as little as 24 hours.
Share your traffic requirements including destination countries, expected monthly volumes, peak concurrent channels, codec preferences, and quality expectations with our wholesale team.
Our wholesale team analyses your traffic profile and delivers competitive, transparent per-minute rates tailored to your specific destination mix, volume commitments, and commercial structure.
Our NOC engineers assist with SIP interconnection, IP authentication or registration, codec negotiation (G.711, G.729, OPUS), and thorough end-to-end testing before going live.
Go live on our network with production traffic. Scale volumes gradually or aggressively — our infrastructure auto-scales to handle traffic spikes without degradation or capacity constraints.
Businesses trust NexGenVoice as a wholesale VoIP provider delivering high-quality voice termination, competitive A-Z routes, advanced routing, and 24/7 telecom engineering support.
Bypass multiple intermediaries and access direct Tier-1 routes for the best call quality, lowest latency, and highest completion rates. Fewer hops means fewer points of failure and consistently superior voice clarity on every call.
The more you send, the lower your per-minute costs. Our tiered pricing model rewards high-volume partners with significant discounts, ensuring your margins improve as your business scales without renegotiating contracts.
Every wholesale partner is assigned a dedicated account manager who understands your traffic patterns, proactively suggests route optimisations, handles billing queries, and serves as your single point of contact for all commercial matters.
Our redundant multi-carrier infrastructure ensures your traffic is always routed successfully. Automatic failover on route failures, geographic redundancy across data centres, and proactive capacity planning eliminate single points of failure.
Monitor ASR, ACD, PDD, and MOS scores per destination, per route, and per time window through our wholesale portal. Data-driven insights let you optimise routing decisions, identify problematic destinations, and maximise profitability.
NexGenVoice Wholesale VoIP interconnects with virtually every softswitch, SBC, and session management platform in the telecom ecosystem. SIP, H.323, and IAX2 support combined with flexible authentication methods mean zero infrastructure changes on your side — simply point your routes to our servers and start terminating traffic.
Explore how wholesale VoIP works, the key performance metrics that determine termination quality, why telecom operators depend on wholesale carriers for global reach, and what separates a premium wholesale provider from commodity-grade alternatives.
Wholesale VoIP (Voice over Internet Protocol) is the business-to-business exchange of voice termination services in bulk volumes. Unlike retail VoIP — where individual users or small businesses purchase phone service directly — wholesale VoIP involves large-scale traffic exchange between carriers, operators, resellers, and service providers who buy and sell minutes by the thousands or millions.
In a wholesale VoIP arrangement, the originating party (often a telecom operator, ISP, or VoIP reseller) generates voice traffic and hands it off to a wholesale termination provider like NexGenVoice, who delivers the calls to their final destination on the PSTN (Public Switched Telephone Network) or mobile networks worldwide. The wholesale provider charges a per-minute rate that is significantly lower than retail pricing because of the bulk volumes involved.
The entire process occurs over IP networks using SIP (Session Initiation Protocol) as the primary signalling standard. Calls are packaged into real-time transport protocol (RTP) streams, routed through the wholesale provider's network, and handed off to local carrier partners in the destination country for final delivery to the called party's phone. This happens in milliseconds, with the end user experiencing no difference in call quality compared to a traditional telephone call.
Voice termination is the process of completing a phone call from its origin to its final destination. In the wholesale context, this involves a chain of interconnected carriers — each responsible for a specific leg of the call's journey. The originating carrier collects the call from the caller, the wholesale carrier transports it across their IP backbone, and the terminating carrier delivers it to the called party's local network.
When a call enters NexGenVoice's network, our softswitch infrastructure performs several critical functions in real time: number translation and routing lookup to determine the optimal delivery path, codec negotiation to ensure audio compatibility, quality-of-service (QoS) classification to prioritise voice traffic over data, and fraud screening to detect anomalous calling patterns before the call is forwarded to the destination.
Our intelligent least-cost routing (LCR) engine simultaneously evaluates multiple possible routes to each destination — considering current ASR, ACD, PDD, cost, and capacity availability — and selects the best-performing route for each individual call. This dynamic routing approach ensures that quality remains consistently high even when individual carrier routes experience temporary degradation.
Telecom operators — from national incumbents to competitive local exchange carriers (CLECs) and mobile virtual network operators (MVNOs) — rely on wholesale VoIP termination to extend their service reach beyond their own network footprint without the capital investment required to establish direct interconnection agreements with operators in every country.
For a regional operator in Europe, for example, establishing direct peering relationships with local carriers in 50+ countries across Asia, Africa, and Latin America would require months of commercial negotiations, technical integration work, and ongoing relationship management for each individual route. A wholesale VoIP provider pre-negotiates these relationships, maintains the technical infrastructure, and offers a single interconnection point that provides immediate access to hundreds of destinations.
This aggregation model dramatically reduces the operator's cost of market entry for new destinations, eliminates the technical complexity of managing dozens of individual carrier connections, and provides a single point of accountability for quality issues. NexGenVoice serves operators ranging from those sending tens of thousands of minutes per month to those routing hundreds of millions — with pricing and support scales that match each partner's business size.
Wholesale VoIP quality is measured by a set of standardised performance metrics that determine both the commercial viability and the end-user experience of voice termination. The three most critical metrics are ASR (Answer-Seizure Ratio), ACD (Average Call Duration), and PDD (Post-Dial Delay).
ASR measures the percentage of attempted calls that are successfully answered. An ASR of 60% means that for every 100 calls placed, 60 are answered and 40 result in no connection (busy signals, network errors, unanswered calls, or voicemail). High-quality wholesale routes typically deliver ASR above 50–60%, while premium Tier-1 routes can achieve 70%+ depending on the destination and traffic type.
ACD measures the average duration of successfully connected calls, typically expressed in minutes. Low ACD (under 2 minutes) often indicates poor route quality, wrong-number traffic, or fraudulent activity. Legitimate wholesale traffic typically shows ACD between 3–8 minutes depending on the use case — with enterprise and mobile termination generally showing higher ACD than calling card or PBX traffic.
PDD measures the time elapsed between initiating the call (sending the INVITE) and the called party's phone starting to ring. Industry-standard PDD is under 5 seconds for most destinations. PDD exceeding 8–10 seconds causes callers to abandon calls before connection, directly reducing ASR and degrading the end-user experience. NexGenVoice continuously monitors all three metrics per route and per destination, automatically shifting traffic away from underperforming paths.
Wholesale VoIP fraud is a persistent and costly threat that costs the telecom industry an estimated $38 billion annually globally. The most common fraud types include PBX hacking (where attackers compromise an enterprise PBX to route unauthorised premium-rate calls), toll fraud (unauthorised use of telecom services), spoofing (manipulating caller ID to bypass authentication), and TDoS (Telephony Denial of Service) attacks that flood SIP infrastructure with signalling traffic.
For wholesale providers, fraud prevention requires a multi-layered approach. NexGenVoice's fraud management system operates at the signalling layer, analysing every INVITE before the call is routed. The system evaluates over 40 real-time parameters including source IP reputation, calling patterns (frequency, duration distribution, destination concentration), unusual destination spikes, time-of-day anomalies, and geographic impossibility flags.
When suspicious patterns are detected, the system can automatically apply rate limiting, block specific source IPs or destination ranges, flag traffic for human review, or immediately terminate active fraudulent sessions. Our NOC team continuously refines detection rules based on emerging fraud patterns observed across our global network, ensuring that new attack vectors are identified and blocked before they impact partners' margins.
Choosing a wholesale VoIP provider requires evaluating route quality (ASR, ACD, PDD), pricing transparency, global coverage, fraud protection, and VoIP infrastructure reliability. NexGenVoice delivers premium voice termination with direct Tier-1 routes, stable performance, and scalable telecom solutions.
Many providers compete primarily on price, offering aggressively low per-minute rates that are only achievable by routing traffic through low-quality grey routes with poor ASR, high PDD, and inconsistent audio quality. While these rates appear attractive on paper, the hidden costs — wasted minutes on unanswered calls, customer churn due to poor quality, and billing disputes over inaccurate CDRs — often make cheap routes more expensive in practice than premium alternatives.
NexGenVoice takes a quality-first approach to wholesale termination. We maintain direct Tier-1 relationships with incumbent carriers in every major destination, invest heavily in our fraud prevention infrastructure, provide fully transparent rate decks with no hidden fees, and staff our NOC around the clock with experienced VoIP engineers. The result is consistently high ASR, low PDD, natural-sounding call quality, and billing that partners can trust — enabling them to focus on growing their business rather than troubleshooting route problems.
Join NexGenVoice's wholesale network and access premium voice termination at competitive rates across 200+ destinations. Scale your telecom business with confidence backed by Tier-1 quality and 24/7 NOC support.
Everything you need to know about NexGenVoice Wholesale VoIP — from traffic requirements and quality metrics to interconnection protocols and pricing.
Wholesale VoIP is the bulk purchase of voice termination services by telecom businesses, ISPs, and VoIP resellers. Wholesale providers like NexGenVoice carry large volumes of voice traffic at discounted per-minute rates that are not available to retail customers. The model works because wholesale providers aggregate traffic from many sources, negotiate volume-based rates with destination carriers, and pass the savings along to their partners — creating a more efficient and cost-effective voice delivery chain than any individual operator could achieve on its own.
Wholesale VoIP is designed for telecom operators, VoIP resellers, ISPs, calling card companies, enterprises with high call volumes, contact centres operating their own PBX infrastructure, and any business that generates or resells voice traffic in bulk. Typical partners include competitive local exchange carriers (CLECs), international callback providers, mobile virtual network operators (MVNOs), hosted PBX providers, and businesses running multi-site voice networks that can benefit from consolidated wholesale termination rather than individual retail phone lines.
ASR (Answer-Seizure Ratio) measures the percentage of calls that are successfully answered out of all calls attempted. For example, an ASR of 55% means 55 out of every 100 calls result in a live connection. ASR is the single most important quality indicator in wholesale VoIP because it directly determines your effective cost per connected minute — if you pay $0.01 per minute but only 30% of calls connect, your effective cost per answered minute is roughly $0.033, making a seemingly cheap rate actually expensive. NexGenVoice maintains industry-leading ASR rates across our route portfolio by using direct Tier-1 paths and continuously optimising routing based on real-time performance data.
Wholesale rates are determined by your traffic volume, destination mix, and commercial agreement structure. We analyse your traffic profile — which countries you call, how many minutes per month, peak concurrent channel requirements, codec preferences, and quality expectations — and offer customised per-minute rates that are competitive and sustainable. High-volume partners receive preferential pricing tiers, and we regularly review rates as your traffic grows to ensure you always benefit from volume economies. All pricing is fully transparent with no hidden surcharges, connection fees, or minimum per-destination commitments beyond your overall volume agreement.
Yes, wholesale services typically require minimum monthly traffic commitments to qualify for wholesale-grade pricing and dedicated support. The specific minimum varies based on your destination mix and commercial structure. Contact our wholesale team to discuss your current and projected traffic volumes — we work with partners at various scales and can often structure arrangements that accommodate growing businesses. Even if your current volume is below our standard wholesale threshold, we can discuss starter programmes designed to help you ramp up to full wholesale levels.
NexGenVoice supports SIP (Session Initiation Protocol) as our primary interconnection protocol, which is the industry standard for VoIP signalling and is supported by virtually every modern softswitch, SBC, and IP-PBX. We also support H.323 for legacy environments and IAX2 for Asterisk-based systems. Authentication options include IP whitelisting (most common for wholesale), SIP registration with digest authentication, and TLS/SRTP for encrypted signalling and media. Our NOC team works with your engineers to configure the optimal interconnection method for your specific infrastructure.
For standard SIP interconnection via IP authentication, we can typically have you testing within the same business day and routing live production traffic within 24 hours of commercial agreement execution. The process involves sharing your source IPs, agreeing on codec support and signalling parameters, completing end-to-end test calls to verify quality, and then scaling to full production volumes. More complex integrations involving H.323, encrypted TLS signalling, or custom routing rules may require additional configuration time — our NOC team will provide a precise timeline based on your specific requirements during the onboarding process.
NexGenVoice employs a multi-layered fraud prevention system that analyses every call at the signalling level before routing. Our engine evaluates over 40 real-time parameters including source IP reputation, calling frequency patterns, destination concentration, time-of-day anomalies, geographic feasibility, and historical behaviour baselines. Suspicious traffic is automatically rate-limited, flagged for review, or blocked entirely depending on severity. We also implement per-partner capacity limits, destination-specific thresholds, and real-time alerts that notify both our NOC and the partner when anomalous patterns are detected. This proactive approach has prevented millions of dollars in fraudulent traffic from reaching our network.
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