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SIP Trunk service and solutions

SIP Trunks Solutions

Consolidating Voice & Data Service Simplifies IT

SIP Trunks Optimize Your Bandwidth & Budget

Leverage the power of cloud-based IP phone features, while extending the value of your existing telephony investments. Connect your IP-enabled PBX to the public telephone system using your existing broadband connection.

Flexibility

Purchase only the SIP trunks you need based on the maximum number of concurrent calls your business requires. Call Bursting Capacity adds call sessions for peak call times, above your purchased amount.

Continuity

Voice traffic travels on a private cloud network and is prioritized over data packets. Calls are completed even if there is an outage on your network.

Cost Savings

Businesses report saving up to 50% over traditional analog landlines. Lower long-distance rates and enjoy free in-network dialing between offices. Calling plans tailored for your business size, call volume, and long-distance usage.

SIX Ways Fusion SIP Stands Out from Alternative SIP Solutions

Not all SIP Trunk solutions, or providers, are created equal. Fusion Connect SIP goes beyond competing SIP offerings.

1. Connection to Any End-Point

Fusion Connect IP-based voice solutions connect to any endpoint so you can modernize your phone system according to your needs and budget. Connect your existing equipment and legacy technology (such as a Key system or on-premises PBX) to Fusion SIP for an affordable solutions and seamless upgrade path.

2. IP Telephony that Matches Your Business Needs

Combine SIP for PBX at your main office with Unified Communications and hosted voice for remote employees and branch offices. Save on long-distance fees! There’s no charge for interoffice calls.

3. Call Bursting Capacity

If your call sessions temporarily spike above your subscribed capacity, we’ve got you covered. Get through a special promotional event, an unexpected support issue, natural disaster, or other source of unforeseen call volume increase, and get back to business.

4. The Right Fit

With our consultative approach, we match the nature of your business and usage demands with telephony solutions and bandwidth that fit. You won’t pay for lines, services, or bandwidth you do not need.

5. Business Continuity

Your business phone system must function, even if your PBX is down or your office has a power outage. Keep your phone system up and running with optional SIP features that are hosted and managed in the cloud, including Auto Attendant, Voicemail, and Call Forwarding.

6. Multi-Factor Security

To help prevent fraud, Fusion SIP protects call initiation by requiring both your SIP credentials and a specific IP address that you assign. Having your company registration locked down to a specific IP address disallows registration from other locations. DNC & TCPA compliance readiness for customer communications.

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What is SIP Trunking?

SIP trunking is a VoIP technology based on the Session Initiation Protocol (SIP) by which telephony providers - like us - deliver telephone and unified communications services to customers - like you - equipped with SIP-based private branch exchange (IP-PBX) and unified communications. Think of it as a modern digital "phone line" but with more flexibility.

SIP Trunk Calling Plans

All SIP Trunks include support for unlimited DIDs. Each SIP Trunk order includes a Business Telephone Number (BTN) for E911 service location, outbound caller name set up, and local directory listing set up.

Local + Long Distance

Ideal for small and medium-sized businesses preferring a predictable monthly bill.

Priced at a per concurrent call session, our plan includes:

  • Unlimited inbound, outbound local, on-net and domestic Long Distance calling to the lower 48 and Canada
  • Flat monthly rate based on number of concurrent call sessions required
  • Choice of add-on features, such as business continuity, calling name service, and call bursting
  • Minimum purchase of 3 concurrent call sessions

Local

Perfect for companies with minimal long distance needs; or, prefer to manage long distance costs with per-minute options.

Priced per concurrent call session/line, our plan includes:

  • Unlimited inbound, outbound local and on-net calling
  • Flat monthly rate based on number of concurrent call sessions required
  • Option to purchase a bundle of outbound domestic LD or toll-free inbound minutes to reduce the per minute rate
  • Choice of add-on features, such as business continuity, calling name service, and call bursting
  • Minimum purchase of 3 concurrent call sessions

Metered

Excellent for businesses with large call volumes and non-standard calling habits, such as call centers.

A lower price per concurrent call path, our plan provides for the following:

  • Flat, low monthly rate based on number of concurrent call sessions required
  • All calls, inbound and outbound, are metered
  • Option to purchase a bundle of outbound domestic LD or toll-free inbound minutes to reduce the per minute rate
  • Choice of add-on features, such as business continuity, calling name service, and call bursting
  • Minimum purchase of 3 concurrent call sessions

We take pride in our customer-first approach, rooted in the values of innovation, integrity, and customer service.

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The Community YMCA Case Study
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The John Stewart Company Case Study
Ken Ganley Automotive Group Case Study

IP-PBX Devices & Manufacturers

Fusion Connect offers one of the most extensive lists of interoperable IP-PBXs and Integrated Access Devices (IADs) in the industry.

View the IP-PBX Device & Manufacture List

Fusion Connect SIP Trunking Also Supports Analog & PRI Trunking

PRI stands for Primary Rate Interface. A PRI Line (usually a T1 in the US) has 23 voice channels and one data/control channel. The line physically connects a business, via its PBX, to the Public Switch Telephone Network (PSTN). The 23 voice channels enable the business to hold 23 calls simultaneously. The channels can be used flexibly and reassigned as needed to meet special demands – like video conferences. Add more simultaneous call capacity by adding PRI lines.

  • Lines and Trunks – Stay in budget with us as your SIP Trunk provider. Only purchase the number of Analog business phone lines or trunks you require, based on the maximum number of concurrent calls your business currently experiences.
  • Voice Gateway – For optimal voice quality, Fusion Connect supplies a Router/IAD with Voice services. It supports voice Quality of Service (QoS), security, and monitoring.
  • Customer Network – Fusion Connect Analog and PRI Trunking works with your existing phone equipment, phone numbers, and IP data network systems. There is no need to acquire new phones or replace equipment.
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SIP Trunks​ FAQs

What is a SIP trunking service​?​

SIP trunking service connects your PBX system or unified communications platform to the public switched telephone network (PSTN) over an internet connection. Instead of using traditional phone lines, it sends voice calls, video conferencing, messaging and SMS over a single IP connection. It offers cost-effective outbound calling and inbound toll-free numbers while maintaining real-time call quality and uptime.

This service provider model supports elastic SIP trunking with redundancy, scaling to meet changing call volume. Provisioning is often self-service via API or portal and it enables features like call routing, call recording and CRM integration. It’s ideal for small businesses through large contact centers seeking a modern telecom solution, including support for Microsoft Teams or Nextiva integrations.

Read more about the advantages of SIP Trunking.

Can I transfer my SIP to another provider​?

Yes, you can transfer your SIP trunking service to another SIP provider. This process, often called porting, involves moving your existing phone numbers and SIP configurations from your current service provider to the new one without changing your phone service setup or equipment.

Before transferring, confirm compatibility between your current PBX system and the new provider. Review any contractual obligations and ask about service migration support, uptime expectations and SIP trunking pricing. A provider experienced with business communications can help maintain high-quality phone calls and consistent connectivity throughout the transition.

Learn why enterprise SIP Trunking adoption is growing.

What does SIP mean?

SIP stands for Session Initiation Protocol. It’s a signaling protocol used to start, manage and end real-time communications, including voice calls, video and messaging over IP networks. SIP is the foundation of many VoIP and SIP service platforms that businesses use for unified communications.

SIP enables features like unlimited calling, call forwarding and integration with customer support systems. It supports scalable systems that can grow with business needs while helping streamline communication through a single internet-based service.

How many calls can a SIP trunk handle?

A SIP trunk can handle multiple calls at once, depending on the number of channels assigned. Each channel supports one incoming or outgoing call and businesses can scale the number of channels based on call volume.

SIP service plans are often designed to be scalable, allowing for more channels as needed. Some providers offer unlimited calling or burstable channels to handle peak usage. This flexibility helps streamline operations and maintain consistent customer support without requiring separate physical lines.

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