In 2025, as businesses worldwide continue to adopt VoIP systems like 3CX, the importance of choosing a reliable SIP trunk provider has never been greater. A good SIP trunk provider not only ensures high-quality voice calls but also supports global scalability, excellent uptime, and seamless 3CX compatibility.
This guide covers the 11 best 3CX SIP trunk providers in the world different countries, including India, the US, UK, Australia, Germany, and more. Whether you’re a startup, an enterprise, or a remote-first team, these providers offer dependable connectivity and integration with the 3CX phone system.
What Is a SIP Trunk in 3CX?
A SIP trunk is a virtual phone line that allows your 3CX phone system to connect to the public switched telephone network (PSTN) via the internet. Instead of relying on traditional analog lines, SIP trunks use VoIP technology to transmit voice calls.
In 3CX, SIP trunks are essential for:
- Making and receiving external phone calls.
- Connecting multiple office branches via the same network.
- Enabling advanced calling features like call routing, recording, and conferencing.
What Role Do SIP Trunk Providers Play?
SIP trunk providers offer the internet-based connection that links your 3CX phone system to the outside world. They are responsible for:
- Routing inbound and outbound calls.
- Providing DID (Direct Inward Dialing) numbers.
- Managing call quality, uptime, and international reach.
- Ensuring compliance with telecom regulations in different countries.
Without a reliable SIP trunk provider, your 3CX system can’t operate effectively beyond internal communication.
Which Factors Matter When Choosing a SIP Trunk Provider for 3CX?
Selecting the right SIP trunk provider depends on multiple technical and business considerations:
1. 3CX Compatibility
Ensure that the provider is certified or officially supported by 3CX. Certified providers are pre-configured in the 3CX system and offer seamless setup.
2. Geographic Coverage
If your business operates internationally or across multiple regions, choose a provider that offers global or multi-country number availability.
3. Voice Quality & Uptime
Look for providers that offer low latency, high uptime SLAs (Service Level Agreements), and strong network infrastructure for HD voice clarity.
4. Cost Structure
Compare plans based on:
- Per-minute calling rates
- Monthly subscription costs
- Included features (e.g., number of channels, toll-free access)
5. Support & Reliability
Strong technical support, 24/7 assistance, and quick troubleshooting are key for business continuity.
6. Security & Compliance
Top-tier providers offer encryption, fraud detection, and compliance with telecom laws (like GDPR, HIPAA, etc.).
How Does a SIP Trunk Work with 3CX?
Here’s a simplified breakdown of how SIP trunking integrates with your 3CX phone system:
- SIP Registration:
Your 3CX instance is configured to register with the SIP trunk provider using authentication credentials. - Number Allocation:
The provider assigns you one or more phone numbers (DIDs) to be used for inbound and outbound calling. - Call Routing Configuration:
In the 3CX management console, you can define routing rules to decide how incoming calls are handled and which extensions or groups should receive them. - Codec Negotiation:
The system and provider agree on a codec (like G.711 or G.729) for voice quality, compression, and bandwidth usage. - Ongoing Monitoring:
Both 3CX and the provider continuously monitor call quality, registration status, and usage metrics.
How to Set Up a SIP Trunk in 3CX?
Here is a high-level overview of setting up a SIP trunk in 3CX:
- Login to 3CX Admin Console
- Go to ‘SIP Trunks’ Section
- Click ‘Add SIP Trunk’
- Choose your country.
- Select a supported SIP trunk provider.
- Enter Trunk Details
- SIP server (hostname/IP)
- Authentication ID and password
- Main trunk number (DID)
- Configure Inbound Rules
- Route calls to ring groups, queues, or extensions.
- Configure Outbound Rules
- Define which calls go through which trunks (e.g., local, international, mobile).
- Test the Trunk
- Make test calls to ensure voice quality, caller ID, and routing work correctly.
Note: If the provider is not pre-listed in 3CX, manual configuration may be required with SIP details and codec preferences.
What Are the Key Benefits of Using SIP Trunks with 3CX?
- Cost Efficiency: No need for physical lines or PBX hardware.
- Scalability: Add or remove channels easily based on business needs.
- Mobility: Support for remote working via 3CX mobile and web apps.
- Feature-Rich: Access voicemail, IVR, call queues, and analytics.
- Global Reach: Make and receive international calls with local DIDs.
- Business Continuity: Failover and disaster recovery options built-in.
Quick Summary: 11 Best 3CX SIP Trunk Providers Worldwide
| S.No. | SIP Trunk Provider | Country | Short Description |
|---|---|---|---|
| 1 | Team IHA | Global | Certified 3CX Gold Partner offering affordable, reliable SIP trunks for Global businesses. |
| 2 | Twilio | United States | Global cloud communications platform with flexible SIP trunking and APIs for developers. |
| 3 | VoIPstudio | United Kingdom | UK-based SIP trunk provider known for security, global reach, and easy 3CX integration. |
| 4 | Peoplefone | Switzerland | Reliable European SIP provider supporting 3CX with multilingual support and local numbers. |
| 5 | net2phone | United States | US-based VoIP and SIP trunking provider with 3CX support and unlimited calling plans. |
| 6 | Didlogic | Canada | Offers high-quality SIP trunks and international DID numbers with 3CX certification. |
| 7 | Telnyx | United States | Delivers programmable SIP trunking and direct 3CX integration with real-time routing. |
| 8 | HITCLOUD | Australia | Australian SIP trunk provider offering local coverage and 3CX compatibility. |
| 9 | VoiceHost | United Kingdom | UK-based 3CX Preferred SIP Trunk provider offering excellent support and failover features. |
| 10 | Messagenet | Italy | Italian VoIP provider trusted for 3CX SIP trunk services across Europe. |
| 11 | Winet | Germany | German VoIP carrier certified for 3CX SIP trunking with advanced business call features. |
Here is the detailed list of the 11 Best 3CX SIP Trunk Providers in the World (2025)
1. Team IHA – India & Other Global 20+ Countries
Country: India
Website: https://www.teamihallp.com/
Overview:
Team IHA is a 3CX Gold Partner and one of India’s leading SIP trunk providers tailored for the 3CX ecosystem. With seamless configuration, flexible pricing, and 24/7 support, Team IHA ensures reliable communication for Global businesses of all sizes.
Why Choose Team IHA:
- Certified 3CX Gold Partner
- Global-based virtual numbers & DID support
- Scalable SIP trunking plans
- Full 3CX support and integration
- Local onboarding and account management
2. Twilio – USA
Country: United States
Website: https://www.twilio.com
Overview:
Twilio is a global cloud communications leader known for its developer-first approach. Twilio Elastic SIP Trunking integrates well with 3CX and provides global reach with powerful APIs and advanced security.
Highlights:
- Global call routing
- Secure TLS/SRTP support
- Pay-as-you-go pricing
- Fast setup with 3CX
- Available phone numbers in 100+ countries
3. Voxbone (Now Bandwidth) – Belgium / Global
Country: Belgium (Headquartered)
Website: https://www.bandwidth.com
Overview:
Previously known as Voxbone, Bandwidth offers reliable SIP trunking across Europe and the US. It provides number provisioning, compliance, and direct PSTN access across several countries.
Features:
- 3CX-compatible SIP trunking
- Global number provisioning
- Enterprise-grade SLAs
- Local compliance support
4. Gradwell – United Kingdom
Country: United Kingdom
Website: https://www.gradwell.com
Overview:
Gradwell is one of the UK’s most trusted 3CX SIP trunk providers for SMEs. It offers UK-based SIP channels, number porting, and excellent compatibility with on-premise or cloud-hosted 3CX systems.
Top Benefits:
- Specialist in 3CX provisioning
- Local UK-based numbers
- High-quality voice and redundancy
- 24/7 technical support
5. Telnyx – United States
Country: United States
Website: https://www.telnyx.com
Overview:
Telnyx is known for its powerful programmable SIP trunks and real-time APIs. It’s fully 3CX-compatible and offers excellent voice latency, fraud protection, and instant number provisioning.
Why It Stands Out:
- Direct-to-carrier connectivity
- Real-time SIP trunk setup
- Global numbers and porting
- Built-in security tools
6. DID Logic – Singapore / Global
Country: Singapore (HQ)
Website: https://www.didlogic.com
Overview:
DID Logic serves over 100 countries and is a top provider for international businesses using 3CX. Its SIP trunks offer affordable calling and virtual numbers in hard-to-reach markets.
Key Advantages:
- Great for international SIP routing
- Works with on-premise and cloud 3CX
- Direct carrier-grade connections
- Competitive global call rates
7. SIPTRUNK.com – USA
Country: United States
Website: https://www.siptrunk.com
Overview:
SIPTRUNK.com is designed with 3CX in mind. It offers easy provisioning through 3CX’s dashboard and no-contract, fully automated SIP trunking services with instant provisioning.
Best Features:
- Auto-provisioning for 3CX
- U.S. numbers and toll-free options
- Fast setup and real-time dashboards
- Built-in call tracking and billing
8. MyNetFone – Australia
Country: Australia
Website: https://www.mynetfone.com.au
Overview:
MyNetFone is one of Australia’s most prominent SIP trunk providers, offering full 3CX compatibility and reliable national/international calling for businesses of all sizes.
Top Features:
- Compatible with cloud-hosted 3CX
- Australian DIDs and number porting
- Tier-1 network infrastructure
- Local tech support
9. NFON – Germany
Country: Germany
Website: https://www.nfon.com
Overview:
NFON is a major player in the European VoIP and SIP market. It offers secure, scalable SIP trunking across Germany and the EU, with 3CX-supported solutions for SMBs and enterprises.
Why Choose NFON:
- GDPR-compliant infrastructure
- Strong presence across Europe
- Integrated cloud voice services
- Certified 3CX partner
10. VoIP.ms – Canada
Country: Canada
Website: https://www.voip.ms
Overview:
VoIP.ms is a flexible and cost-effective SIP trunk provider known for DIY-style control. It provides 3CX-compatible SIP services and is popular with tech-savvy SMBs.
What Makes It Great:
- Canada/U.S. virtual numbers
- Real-time call monitoring
- Excellent support documentation
- Month-to-month pricing
11. Net2Phone – Latin America / USA
Country: USA / Latin America
Website: https://www.net2phone.com
Overview:
Net2Phone offers 3CX SIP trunking across North America and Latin America. Known for strong infrastructure, it’s ideal for global enterprises with Latin American customer bases.
Why It’s Included:
- 3CX-certified
- Latin America-focused routing
- Local numbers in 30+ countries
- Multi-language customer support
Conclusion: Choose the Right 3CX SIP Trunk Provider for Your Business
Whether your business operates in India, the U.S., Europe, or across borders, selecting the right SIP trunk provider is key to optimizing your 3CX phone system. Compatibility, scalability, and support are crucial factors when making your decision.
If you’re looking for a trusted partner in India, Team IHA is a 3CX Gold Partner and officially listed in the 3CX Partner Directory. We provide:
- Certified SIP trunking solutions
- Complete 3CX setup and integration
- 24/7 local support
- Custom onboarding and training
Get in touch with Team IHA to power your business communication with reliable SIP trunking and expert 3CX implementation.
Frequently Asked Questions
A 3CX SIP trunk provider enables your 3CX phone system to make and receive calls over the internet using VoIP technology.
Consider factors like pricing, call quality, country coverage, customer support, and 3CX certification when choosing a provider.
Yes, Team IHA is a certified 3CX Gold Partner in India, offering reliable SIP trunking with excellent local support.
Yes, many global providers like Twilio, Telnyx, and VoIPstudio support 3CX and offer international call coverage.
Certified providers ensure seamless 3CX integration, better voice quality, technical support, and compliance with local telecom laws.
