Best SIP trunk Providers in the USA

SIP trunk providers are essential for modern businesses, especially large companies, enabling cost-effective and scalable communication solutions over the Internet. They significantly reduce costs by replacing traditional phone lines, particularly for long-distance and international calls. They also offer flexibility by integrating seamlessly with existing PBX systems and supporting advanced features like call routing, conferencing, and unified communications.

Furthermore, SIP trunks ensure high reliability with services like call failover and redundancy, minimizing downtime. Additionally, they provide enhanced scalability, allowing firms to add channels or expand to new geographic locations effortlessly.

Plus, SIP trunk providers enable global reach and secured communications through encryption and fraud prevention while supporting businesses in optimizing their operations for a smooth communication experience.

Before choosing a reliable SIP trunk provider in the USA, there are a few factors, such as features, quality, pricing, and others, that need to be considered, which make a big difference in the quality and reliability of your communication.

Initially, explore all the services that SIP trunk providers offer. Basic features should include call forwarding and routing, conference calling, voicemail to email, and call transcription. Analyze all these features and choose according to your needs and budget.

High call quality is very important for businesses to maintain smooth connections. Ensure the providers offer a stable connection with minimal latency or packet loss, as these factors directly impact call clarity and reliability. 

As the business expands, the call volume increases, and a provider is needed that can add channels or new geographical locations without delay. Your provider should be able to add more features as your business grows and vice versa.

Compare the pricing of the different SIP providers in the USA according to features, setup costs, and international calling charges. Some providers offer affordable pricing models that match your features. Transparent pricing, free trials, and no hidden fees are essential to keeping your solution cost-effective.

Security is the most important factor to consider when choosing the best SIP trunk providers in the USA. It is necessary to protect files against unauthorized access and data breaches. Make sure the providers offer security features such as encryption, firewall, and denial of service (DoS) attacks to safeguard business information and customer trust.

Since there are many SIP trunk providers in the USA, here’s a list of some of the top for your convenience.

SIP.US is a leading SIP trunking service in the US. It charges by the SIP channel, and each channel offers unlimited calls to 48 US states. It provides the service for IP-PBX systems and digital and analog telephone adapters. Key features include direct inward calling and a Tier-1 redundant network.

SIP.US keeps real-time call data records that enable the users to track operations and understand their needs.
 

Key Features:
 

• Powerful Control Panel
• Widespread DID Coverage
• Fast Integrations
• International Toll Fraud Protection
• Real-Time Call Data Records

Pricing:
 

• SIP Channel: 
  Monthly: $24.95/channel/month
  Yearly: $19.99/channel/month
• Inbound DID Telephone Numbers (per month): $1.00-$2.50
• Business Texting (per month): $9.95-$79.95
• SimpleFAX™ Service: $24.95 per fax line/month
• Fax-to-Email: $14.95 per number/month

RingCentral is an American SIP trunk provider that allows businesses to connect their on-premises PBX to the cloud. It offers a robust set of features that enhance the communication of businesses of all sizes and provides flexible options for scaling their operations without the need for extensive physical infrastructure.
 

Key Features:
 

• Call Management and Phone System Administration
• Multi-level Auto Attendant
• Single Sign-On (SSO)
• Real-Time Analytics
• Cloud PBX

Pricing (If billed annually):
 

• Core: $20/user/month
• Advanced: $25/user/month
• Ultra: $35/user/month

Twilio is a prominent SIP trunk provider known for its powerful API-driven communication solutions. Its highly flexible and developer-focused platform enables robust customization and programmable voice capabilities.
 

Key Features:
 

• Programmable Voice API
• Automated Attendant
• Access Controls/Permissions
• Programmable messaging API

Pricing in USA: 

To make calls:
 

• 48 States (Zone 1) - $0.0053/min
• Hawaii (Zone 2) - $0.0095/min
• Alaska (Zone 3) - $0.0315/min
• High Cost (Zone 4) - $0.0420/min
• Toll Free - $0.0011/min

To receive calls:
 

• Local- $0.0034/min, +$1.15/mo
• Toll-Free- $0.0130/min, +$2.15/mo

Nextiva is a well-known SIP provider that enables businesses to manage voice communications over the Internet. It brings the team closer by connecting them in a single AI-powered platform and provides unlimited calling throughout the US.

Nextiva serves more than 1,000,000 businesses with its all-in-one client experience platform.

Key Features:
 

• Call Groups
• Greetings & Announcement
• Analytics & Reporting
• Third-party Integrations
• Fraud Mitigation

Pricing: 
 

• Metered: $14.95/month (plus $0.008 per minute)
• Unmetered: $24.95/month (Unlimited calls nationwide)

AstraQom International is a multinational business telecommunication service provider that offers various services to companies, such as SIP Trunks, Cloud-Hosted PBX, and Business SMS services worldwide. It currently serves more than 100 countries, including the USA.
 

Key features:
 

• Call Queues
• Call Parking
• Custom Greetings
• Remote Extensions
• Fax To Email

SIP Trunks USA Prices (per month):
 

• Starter - $15
• Corporate - $43
• Deluxe - $71

Vonage is a cloud communication provider that enables both inbound and outbound calls through SIP infrastructure. It offers scalable voice, video, and messaging capabilities across Communication APIs and Unified Communications.
 

Key Features:
 

• Automatic Speech Recognition
• Virtual Receptionist
• Unlimited Calling
• Auto Attendant
• Call Hold and Music on Hold

Pricing in USA:

To make calls:
 

• Using PSTN Leg - $0.01331/min
• Using SIP Leg -  $0.00419/min

To receive calls:
 

• Using PSTN Leg - $0.00472/min
• Using SIP Leg - $0.00419/min
   

Additional features:
 

• Automatic Speech Recognition - $0.0171 (per 15-second interval)
• WebSockets - $0.0042 per minute (charged per second)

AVOXI is a global provider of SIP trunking services that offers scalable and secure voice communication solutions for businesses. It allows the organization to manage the voice calls over the internet, enhancing flexibility and potentially reducing costs compared to traditional telephony systems.

Key Features: 

• Multi-level IVR
• Call Notes
• Local DID
• Voicemail
• API Access

Pricing:
 

• 1 Channel + Softphone: Free
• 12 Channels: $9.99
• DID Numbers: Start at $4.49
• Toll-Free Numbers: Start at $16.99
• Calls to US48: $0.011 per minute

IntelePeer is a privately held business in Florida that delivers cloud-based SIP trunking solutions emphasizing automation, integration, and efficiency. These solutions help businesses streamline their communication processes and provide flexible, reliable, and secure voice and messaging services.

Key Features:
 

• Activity Dashboard
• Appointment Scheduling
• Auto-Dialer
• Blended Call Center
• Omnichannel communication platform

Pricing:

• Contact Sales

8*8 is a SIP trunking provider in the USA that offers a unified communication system for business. As a leader in VoIP solutions, it offers reliable and secure SIP trunking as part of its extensive range of voice and video communication solutions. They are well-suited for businesses looking for comprehensive communication services.
 

Key Features: 

• Visual Voicemail
• Call Parking
• Meeting Recording & Transcription
• Intelligent Call Routing
• Auto-attendant

Pricing: 

• Contact sales

Flowroute is an online platform that provides SIP trunking and SMS services, designed for use with contact centers, CPaaS (Communications Platform as a Service), and both physical and virtual PBX systems. It's fully cloud-based, allowing organizations to manage important voice applications easily and efficiently.
 

Key Features: 

• CNAM (caller name) Lookup
• Outbound Calling
• API Access
• Call Analytics

Pricing:

• Contact Sales

Setting up SIP trunking for your business is an important step toward modernizing communication systems and reducing costs. Whether you’re transforming from a traditional PBX system or starting fresh with a virtual setup, SIP trunking provides a scalable and flexible solution for voice, video, and messaging over the internet.

• Identify if you need voice, video, SMS, or team messaging.
• Determine phone number requirements (local, toll-free, international).
• Assess routing needs (simple routing or IVR menus).
• Estimate call volume and concurrent users.

• Identify reusable hardware (routers, VoIP phones, IP PBX, SBC).
• Decide whether to repurpose a legacy PBX (which may require Analog Telephone Adapter (ATA) and Session Border Controller (SBC)) or opt for a virtual SIP trunking setup.

• Check pricing (per line or minute for Elastic SIP).
• Ensure compatibility with existing infrastructure.
• Review features (IVR, call routing, voicemail, analytics).
• Confirm phone number options (local, toll-free, international).

• Discuss with the provider if IP PBX, VoIP phones, ATA, or SBC are required.
• Confirm setup complexity and available support.

• Work with the provider for hardware installation, SIP trunk setup, and phone number registration.
• Configure routing, call controls, and IVR.
• Train staff and access 24/7 support for smooth operation.
   

SIP trunking ensures efficient, scalable communication with minimal maintenance once implemented.

Selecting the best SIP trunk provider in the US and setting up your SIP trunking system is crucial for modernizing your business communication in the United States. Start by defining your communication goals, such as the need for voice, video, or messaging, and identifying routing and phone number requirements. Evaluate your existing infrastructure to determine if you can reuse hardware or need a virtual SIP trunking setup.

Compare providers based on pricing, compatibility, features like IVR and analytics, and phone number offerings, ensuring they align with your business needs. Plan for any additional equipment required, such as IP PBX systems or VoIP phones, and clarify the setup process with your provider. Collaborate with the provider to handle installation, configure features, and train your staff. With the right SIP trunk provider, you’ll benefit from cost-effective, scalable, and secure communication that supports your business growth and ensures seamless operations. SIP.US, RingCentral, Nextiva, Vonage, and others mentioned above are some of the best SIP trunk providers in the US. Subscribe to one and enjoy calling at minimal rates. However, compare their prices, features, pricing, and more before doing so to get the best one.

A single SIP trunk can handle 20-25 calls simultaneously. Well, the high-capacity SIP trunk can handle up to 100 calls, depending on the codec and bandwidth.

A single SIP can handle multiple channels, so only one SIP trunk is needed for the businesses.

Generally, SIP trunk calls cost between $0.01 and $0.03 per minute. However, the cost depends on the providers, the features they provide, and the plan you choose.

You can choose the best USA SIP trunking provider by evaluating factors like call quality, reliability, pricing, and scalability. Ensure they offer security features, 24/7 support, and compatibility with your existing PBX or VoIP system.

Yes, you generally need a compatible PBX to use the SIP trunk effectively.