SIP & Integrations

Deploy Voice Globally with SIP Integrations

Deliver voice across your contact center and enterprise communications with no coding or changes to your application stack. Get exceptional voice coverage, quality and flexibility with a single provider. It’s that easy. 


PBX Systems

Improve your infrastructure
in minutes


CCaaS Platforms

Streamline calls
across your CX channels.


UCaaS Platforms

Boost Microsoft Teams
collaboration and productivity.


Beyond Voice Integrations

We connect to your
favorite business tools.

SIP Into Your Preferred Communications Platform

It’s all about working smarter, not harder within your tech stack. And when it comes to your existing phone solution, you should have access to the most global coverage out there.

Our SIP trunking and integrations can help you do just that. 

Configure, customize and gain more reach for your legacy PBX, CCaaS, UCaaS and other business tools when you power your communications with us. Our SIP advantage includes scalable voice across 150+ countries, unlimited channels, intentional cloud redundancy (that’s a good thing) for operational continuity, flexible pricing options and eliminating the reliance on traditional phone lines. 


What is our SIP trunking capability?

We provide businesses with a voice connection over the internet (VoIP) to bring traditional on-premise PBXs, hybrid and hosted phone systems more reach and tools on the cloud. 

How SIP Call Flow Works Within Your Stack

Think of a SIP trunk as a telephony highway. For every incoming or outgoing phone call, one SIP channel is required. The highway is the SIP trunk where all the voice traffic flows, lanes are the channels and the cars are the phone calls.


Inbound (Origination)


Outbound (Termination)


Get More From Your Existing Platform With Integrated SIP Trunking


SIP trunking for PBX

Give your phone system a new voice experience.

Affordable SIP trunks, zero maintenance

Say goodbye to analog phone lines, costly long-distance rates and user maintenance responsibilities. SIP saves you money with VoIP capabilities, unlimited channels and providers taking care of all system rollouts and updates. 

Cloud migration on your terms

Bring your desk phone to the cloud and reduce costs and dependency on on-premise infrastructure. SIP us straight into your legacy PBX system, including Avaya, 3CX, Asterisk and more, to support your concurrent calls.

Maintain business continuity

With several global data centers for failover routing and end-to-end call encryptions, rest assured that your business will always remain online and secured no matter what.

Contact Center as a Service (CCaaS)

Streamline communications across your CX channels.

Create efficiency

Easily convey personalized messages and expand your reach to your customers on any communications channel when you SIP us into your preferred contact center platform: Five9, Genesys, Nice inContact and Talkdesk.

Bring your own carrier (BYOC)

Keep your established carrier and their call rates with our BYOC program.  Unbundle your services and choose your own provider to connect to the cloud for better control over your tech stack.

Deliver top-notch services

Within your contact center platform, easily deliver exceptional service to your customers using tools that offer premium support and increase first-call resolution, including queue callback, skills-based and VIP routing.


Unified Communications as a Service (UCaaS)

Improve performance and productivity across your collaborative tools.

Go beyond limitations

Pair your Microsoft Teams, Zoom or Webex platform with our expansive country global coverage network using direct routing. Reach customers in more places and fill in the gaps where UCaaS providers comes up short.

Boost engagement and collaboration

Upgrade your outbound calling to 90+ countries around the world. Leverage guaranteed local caller ID to boost engagement rate and better strengthen your global communications and internal collaboration. 

Eliminate app toggling

Give your team more support to help boost productivity. Integrate your conferencing tools, voice calls, messaging and call recording together to work as one, accelerating proficiency in one place without toggling between apps.

We Talk to the Business Tools You Use Most


Customer Relationship Management (CRM)

Connect us to Salesforce, HubSpot, Zoho and more.


Communications Platform as a Service (CPaaS)

Connect us to Twilio and more.



Connect us to Zendesk, Help Scout and more.


Sales Automation

Connect us to Pipedrive and more.



Connect us to Intercom and more.

Connect With Customers Your Way

Web Application

Moving to the cloud is as easy as 1-2-3.
Connect your phone system with us and gain access to scalable voice, seamless integrations and enterprise-grade network security in your web browser.

Learn More

Programmable Voice APIs

Build an engaging voice integration that works for you, in the environment you work best in. Tap into new markets and manage your number inventory securely using customizable voice APIs.

Learn More

SIP & Integrations FAQ

You can deploy international SIP trunks and start managing calls in a matter of minutes. 

SIP trunks from AVOXI are $19.99 per month with unlimited channels.

Yes! For guaranteed outbound caller ID, choose any number labeled "TrueLocal" in the shopping cart. TrueLocal numbers are 2-way SIP trunk numbers with local origination and termination, ensuring caller ID works as intended every time. 

Outbound caller ID may work even when using numbers not labeled TrueLocal. However, we can only guarantee proper CNAM when using TrueLocal numbers.

In addition to Microsoft Teams, AVOXI's global VoIP SIP services work with virtually any phone system setup. See our pages with popular integrations:

In addition to the best USA virtual phone number services for business, popular solutions from AVOXI include our communications platform, enterprise voice, and global SIP trunking.

SIP Trunking

SIP trunking has emerged as a vital component in modernizing communication infrastructure for businesses. To help you gain a better understanding of this important element of business communication, we’ve compiled a concise overview of SIP trunking and its benefits.

What Is SIP Trunking?

SIP trunking utilizes the Session Initiation Protocol (SIP) to establish and manage communication sessions over the internet. Unlike traditional telephone lines, sip trunking enables businesses to transmit voice, video, and other multimedia content through an IP-based network. By leveraging the power of the internet, organizations can streamline their communication processes, enhance flexibility, and potentially reduce costs as well.

Advantages of SIP Trunking

  • SIP trunking eliminates the need for multiple physical phone lines by consolidating voice and data traffic onto a single network connection, simplifying management and reducing maintenance costs. 
  • SIP trunking enables greater scalability, allowing businesses to add or remove lines based on their needs without significant infrastructure changes
  • SIP trunking offers geographical flexibility, empowering organizations to establish a local presence in different areas without the need for physical offices.

SIP trunks offer compatibility with various communication channels, allowing integration with unified communications platforms, messaging applications, and other collaborative tools.

In addition to scalability and integration, SIP trunking provides a range of advanced features. With unified communications, organizations can consolidate their communication channels, such as voice, video, instant messaging, and presence, into a single platform. Virtual phone numbers enable businesses to establish a local presence in different geographic locations without the need for physical infrastructure, expanding their reach and enhancing customer interactions.

It’s very important for businesses to select reliable SIP providers. Some of the best ways to gauge a SIP provider are to evaluate their network reliability and quality of service, security, and customer support.

What Is SIP Trunk In Telecom?

SIP trunking is a fundamental concept in the realm of telecom that revolutionizes the way voice and multimedia communication are routed. Unlike traditional phone lines, SIP trunks utilize the Session Initiation Protocol (SIP) to establish connections over the internet, enabling seamless connectivity between IP-based systems.

SIP Trunk Requirements

When it comes to SIP trunk providers, it is crucial to consider specific requirements, such as:

  • Network reliability
  • Service quality
  • Security measures
  • Customer support

SIP Trunk vs. PRI

SIP trunks are often compared to Primary Rate Interfaces (PRIs) or traditional phone lines, but SIP trunks generally offer greater scalability.

SIP Trunk Example

To illustrate a sip trunk example, imagine a multinational company that requires a centralized communication system. With SIP trunking, they can connect their branch offices located in different countries to a central PBX, eliminating the need for individual phone lines at each location.

By understanding what SIP trunking is in telecom, businesses can gain the knowledge they need to leverage this technology for efficient and cost-effective communication. Partnering with reliable SIP trunk providers can also help organizations harness the scalability, integration, and advanced features of SIP trunks in order to optimize their communication infrastructure.

How Does SIP Trunking Work?

SIP trunking relies on SIP messages for call routing. 

  • Once the call is initiated, the calling party's system forwards the call to the SIP trunk provider, which routes the call to the intended destination. 
  • The SIP trunk provider takes into account availability, call routing rules, and any necessary transformations to ensure the call reaches its destination. 

This process allows businesses to connect with various networks and reach recipients anywhere in the world, using IP-based communication.

Once the call is successfully connected, the process of establishing a media channel begins. The calling and receiving systems negotiate the appropriate media formats and codecs for the voice and multimedia data exchange. This allows for real-time communication, enabling the participants to engage in voice conversations or transmit video and other multimedia content seamlessly.

 How Many SIP Trunks Do I Need?

To determine how many SIP trunks a business needs, several factors should be considered, including call volume, concurrent calls, and expected growth.

What Is a SIP Channel and How Many Channels In SIP Trunk?

The number of channels in a SIP trunk is also an important consideration, as each channel can handle only one call at a time. Businesses can typically determine the optimal number of SIP trunks and channels needed to support their operations by analyzing their communication requirements and consulting with a SIP trunk provider.

SIP Trunk Configuration

Configuring SIP trunks necessitates specific requirements, typically including: 

  • A compatible IP-based communication system (PBX)
  • An internet connection with sufficient bandwidth
  • A reliable SIP trunk provider

It is essential to ensure that the network and equipment are properly configured to support SIP trunking. It’s usually best to work closely with the provider to establish the necessary settings for a seamless and reliable communication experience.

SIP Trunk vs. VoIP

What about SIP trunking vs. VoIP? SIP is the protocol that facilitates many Voice over Internet Protocol (VoIP) calls. While SIP trunking is not required to make VoIP calls, SIP offers added flexibility and scalability, allowing businesses to leverage their existing IP-based infrastructure while benefiting from advanced communication features and cost savings.

SIP Trunk Pricing

SIP trunk pricing normally involves a range of components that may contribute to the overall cost of implementing SIP trunking. Understanding these factors is crucial for businesses considering the adoption of SIP trunks. 

  • The initial investment for SIP trunking involves a few upfront expenses, including the cost of an IP-PBX system, which serves as the foundation for handling SIP calls within the organization. 
  • Compatible hardware (such as SIP-enabled phones or adapters) may be required. It is essential to evaluate existing infrastructure and determine if any upgrades or investments are needed. 
  • Adequate internet bandwidth is another consideration to ensure smooth and reliable communication.

Recurring fees are another significant aspect of SIP trunk pricing. SIP trunk providers typically charge line rental fees, which cover the connection and availability of the SIP trunk. These fees can vary depending on the number of SIP channels required to support simultaneous calls. Per-channel fees are normally levied for each active call or SIP channel used. It is a good idea to assess your business's call volume and choose a pricing plan that aligns with its needs. 

Additional services or features, such as call recording, auto attendants, or virtual phone numbers, may also incur additional charges.

SIP trunk pricing can vary among providers, and it is advisable to research and compare SIP trunk cost and pricing plans. Understanding the SIP trunk pricing structure and assessing the total cost of ownership is essential for businesses that are searching for a solution that meets their communication needs while also aligning with their budget.

Best SIP Trunk Providers

When it comes to choosing the best SIP providers for business, there are several factors to consider to ensure seamless and efficient communication. SIP trunking offers numerous advantages in modern business communications, and partnering with a reliable sip service provider is essential for unlocking its full potential.

How to Choose a SIP Trunk Provider

First of all, the best providers offer high-quality and reliable network connectivity, ensuring clear and uninterrupted voice and multimedia communication. This is crucial for maintaining professional and efficient interactions with clients, partners, and colleagues alike.

Secondly, top-notch SIP trunking providers typically offer flexible and scalable solutions. They understand that businesses' communication needs can evolve rapidly, and they provide the ability to easily scale up or down the number of SIP trunks and channels based on demand. This flexibility enables businesses to optimize their communication systems and avoid unnecessary costs.

Finally, the best sip trunk providers prioritize security. They implement robust security measures, such as encryption and authentication protocols, to protect sensitive communication data from unauthorized access and potential threats.

Businesses should also assess the quality of customer support and technical assistance offered when comparing SIP trunking providers. Reliable providers have knowledgeable and responsive support teams available to address any issues or queries promptly, ensuring smooth operations.

SIP Trunk Solutions from AVOXI

AVOXI is a trusted SIP trunk provider. With the expertise and comprehensive solutions AVOXI has to offer, businesses can streamline their communication systems and improve collaboration. AVOXI’s SIP trunking services offer high-quality connections, scalability, advanced features, excellent customer support, and more.

By exploring SIP trunking as a solution with AVOXI, businesses can leverage the advantages of this valuable technology to enhance their communication infrastructure and drive overall efficiency. With AVOXI as your trusted communications partner, your business can enjoy the benefits of seamless communication and gain a competitive edge in the modern business landscape.