Trusted By Leading Carriers, OTT Apps, and Global Enterprises
Voice over Internet Protocol (VoIP) gives businesses the flexibility and scalability to handle communications across locations and markets—but call quality can vary significantly depending on network conditions, bandwidth, routing, and infrastructure.
Global Telecom Testing (GTT) provides real-world VoIP call quality testing services designed to identify issues such as latency, jitter, packet loss, dropped calls, and poor audio quality. Our in-country testers evaluate VoIP performance from the user’s perspective, helping businesses understand how calls actually sound and perform across global markets.
Whether you’re launching a new VoIP service, troubleshooting customer complaints, or monitoring an existing platform, GTT helps uncover the issues affecting call quality so your team can improve reliability and customer experience.
A VoIP connection may technically complete while still delivering a poor customer experience. Audio delays, choppy conversations, dropped packets, echo, and inconsistent network performance can make calls difficult or frustrating for users.
GTT evaluates VoIP performance under real-world conditions using local, in-country testers to assess network stability and the actual call experience. Testing measures critical factors such as latency, jitter, packet loss, audio clarity, and Quality of Service (QoS), helping your team identify where performance problems originate.
Organizations can combine VoIP testing with international phone number testing to validate both call connectivity and voice quality throughout the complete customer calling experience.
What Our VoIP Testing Validates
Beyond standard testing, we provide advanced services to diagnose persistent issues:
Latency Testing
Measure delays between the sender and receiver to identify issues that cause noticeable pauses, overlapping conversations, and unnatural call experiences.
Jitter Testing
Evaluate variations in packet arrival times that can cause distorted, choppy, or inconsistent audio during VoIP calls.
Packet Loss Testing
Identify missing or dropped voice data packets that can result in audio gaps, distortion, and reduced call quality.
Audio Quality Testing
Evaluate the actual voice experience for clarity, consistency, echo, distortion, and other issues that can make conversations difficult to understand.
Quality of Service (QoS) Testing
Assess the network conditions and performance factors affecting VoIP traffic to determine whether voice communications are receiving the resources required for reliable performance.
Bandwidth & Network Performance Testing
Evaluate whether available network capacity can adequately support VoIP traffic and identify congestion or infrastructure limitations that may affect call performance.
Real-World In-Country Testing
Replicate the actual customer experience with testing performed from local markets, helping uncover geographic, carrier, and network-specific VoIP issues.
Ongoing VoIP Monitoring
Conduct recurring testing to identify emerging call quality problems and performance degradation before they become widespread customer issues.
Define Your VoIP Testing Requirements
Share the countries, phone numbers, networks, call scenarios, and performance concerns that need to be evaluated. GTT develops a testing plan based on your VoIP environment and quality objectives.
01
Conduct Live VoIP Test Calls
In-country testers place and receive real calls to replicate actual customer experiences across the markets and network conditions relevant to your business.
02
Measure Call Quality & Network Performance
GTT evaluates audio clarity, latency, jitter, packet loss, QoS, connection stability, and other performance factors to identify problems affecting the voice experience. Where broader network conditions may be contributing to performance issues, WiFi hotspot and latency testing can provide additional connectivity insights.
03
Report Issues & Optimize VoIP Quality
Testing results identify call quality and network performance concerns so your team can isolate problems, make infrastructure or configuration improvements, and deliver a more consistent voice experience.
04
Choose the testing model that best fits your call volume, markets, and quality assurance requirements
Experience GTT's real-world VoIP testing capabilities with a complimentary trial test before establishing a larger testing program.
Experience VoIP Calls the Way Your Customers Do
VoIP performance depends on much more than whether a call connects. Network conditions, bandwidth, latency, jitter, packet loss, equipment, and routing can all influence how a conversation sounds to the person on the other end.
GTT approaches VoIP testing from the actual user's perspective. With a network of local testers across 200 countries, GTT can evaluate voice communications under real-world, in-country conditions and identify performance issues that may be difficult to reproduce through internal testing alone.
By combining technical performance measurements with live user experience validation, GTT helps organizations uncover the causes of poor voice quality and make informed improvements to their VoIP infrastructure.
Why Businesses Choose GTT
In-country testing capabilities across 200 countries
Real-world voice quality validation
Latency, jitter, packet loss, and QoS testing
Local testers using realistic network conditions
Testing for both call quality and network reliability
Flexible one-time and ongoing testing programs
More than 20 years of telecom testing experience
Live testing that complements automated monitoring
For organizations operating broader international telecom environments, GTT can also combine VoIP testing with global roaming testing to evaluate connectivity and voice performance across international mobile networks.
A Message from Our CEO:
Learn how our unique in-country live testing provides unparalleled accuracy and reliability.
Discover how we’ve helped global enterprises solve their toughest telecom challenges.
Telecom Equipment Hosting
savings on hosting fees by using GTT’s local staff and on-site equipment instead of data centers.
eSIM with Global Useage
savings on eSIM costs, activation, and subscriptions compared to other vendors.
Regular Phone Number Testingg
of outstanding issues resolved within just 1–2 months through weekly and monthly number testing.
Annual Inventory Testing
of phone numbers in company inventories are non-operational on average.
Serving the telecom industry for
20+ years
Over 900 in-country testers in
200+ countries
Optimize the performance of your VoIP Call Quality Testing capabilities and save money on unnecessary costs from your network carriers.
Key metrics in VoIP Call Quality Testing include latency, jitter, packet loss, and clarity of audio. These measurements define how well calls perform and whether communication remains smooth during real-time use.
A VoIP quality test focuses on the technical elements that affect user experience. Latency measures delay in call response, jitter reflects variations in audio delivery, and packet loss shows missing data that reduces clarity.
Together, these metrics highlight overall quality and reliability of the system. VoIP testing uses these measures to evaluate performance so calls remain stable and understandable for business or personal communication.
VoIP testing aligns with industry standards by measuring call quality against accepted thresholds for latency, jitter, and packet loss. These benchmarks confirm that communication systems perform reliably and consistently within globally recognized expectations.
Standards set by organizations such as the ITU and IETF guide how testing is performed. A VoIP test applies these criteria to check if voice delivery meets the expected ranges for clarity, responsiveness, and stability. VoIP Call Quality Testing follows the same guidelines in realistic conditions. It verifies that systems comply with established norms and identifies where improvements may be required. This process supports dependable communication by showing how a system performs under industry rules.
Metrics are tested in realistic environments through simulated user conditions, including variable network speeds and regional traffic. This approach gives accurate insights into how calls perform in everyday scenarios.
A VoIP test replicates situations like weak signals, congestion, or fluctuating capacity to measure stability. A VoIP quality test then analyzes results for clarity, delay, and consistency during communication. VoIP Call Quality Testing applies these simulations across diverse environments, producing data on performance reliability.
In practical terms, this means the testing reflects actual user experiences. The results become especially valuable for predicting service quality across multiple regions and under different network conditions.
VoIP testing can replicate network congestion, bandwidth throttling, and codec negotiation to represent challenging conditions. These simulations show how call quality adapts when networks are under strain.
During a VoIP test, evaluators recreate limited bandwidth or congested traffic to track call stability. Codec negotiation is also examined, which demonstrates how the system adjusts to preserve clarity during resource changes.
A VoIP quality test applies these factors to mirror real communication environments. VoIP Call Quality Testing then provides results that reflect performance under pressure. This approach helps teams clearly understand how calls behave when networks shift, reduce capacity, or experience sudden unexpected changes in overall traffic conditions.
with the only company worldwide testing in 200 countries.
