SIP Trunking

  • Converge Voice and Data over a Single IP Network and Maximize Your IP-PBX Investment

    XO SIP Service unifies voice, data and Internet services over an IP connection, leveraging your existing IP-PBX. It’s an ideal converged solution for a single location business with 10 or more phone lines.

    Based on the Session Initiation Protocol, a SIP trunk provides the connection between your network and the public switched telephone network (PTSN). With this SIP trunk connection, you can make phone calls from your IP-PBX device without additional physical wiring, thereby reducing the recurring costs of separate voice and data circuits and the costs associated with the purchase, support and maintenance of media gateways.

    Integrated access combines your voice and data onto a common access circuit, enabling you to achieve greater economies of scale and simplify the management and maintenance of your communications infrastructure.

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    855.339.4417

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  • What you can expect from XO SIP Trunking Services:

    • Complete end-to-end management:  XO SIP Trunking includes both the access circuit and port, making it easy to manage and maintain.
    • Out-of-the-box connectivity:  Setup is a breeze, thanks to lab-certified interoperability with leading IP-PBXs.
    • Fast and reliable service quality:      Get direct, always-on access to the XO nationwide 100% IP Tier 1 network and the Public Switched Telephone Network.
    • Flexible bandwidth options:  Choose the bandwidth that meets your business needs, from 1.5 Mpbs to 1 Gbps.
    • Make more calls without buying more bandwidth:  Voice compression technology allows more simultaneous voice calls on the same bandwidth; and dynamic bandwidth allocation allows you to maximize circuit utilization while ensuring that critical voice traffic gets the highest priority.
    • Free Calling:  Get free local calls; and get free calls between your XO SIP and XO IP Flex locations.
    • Ease-of-use:  Easily change, add and manage voice features online, in real time, from anywhere using a secure, intuitive web portal.

    XO is a SIP provider for small-to-medium size businesses as well as enterprise level businesses. XO SIP Trunking service is designed for small-to-medium businesses with fewer than 500 employees and fewer than 10 locations. For larger businesses, XO Enterprise SIP Trunking offers SIP services that meet the unique needs of large, multi-location organizations. XO Hosted PBX is designed for those organizations seeking to eliminate their investment in PBXs altogether. 


  • Standard Features

    • Operator Services
    • E911
    • Directory Assistance
    • Full compliance with Communications Assistance for Law Enforcement Act (CALEA) requirements
    • Local Direct Inward Dialing numbers (DIDs)
    • Dedicated Internet Access
    • Web hosting
    • Bandwidth-based voice and data pricing, regardless of the number of lines/sessions 
    • Flexible calling plans for off-net calling
    • Manage voice features in the secure, self-serve XO Business Center

    Optional Features

    • Voice compression:  Make additional simultaneous calls over the same bandwidth
    • Virtual DID numbers:  Allow customers outside of your calling area to make free local calls to you
    • Auto attendant:  Field outbound calls, delivering them to the intended destination
    • Voice VPN:  Configure private dialing plans for on-net call routing
    • Automatic call routing/ business continuity failover:  Automatically redirect incoming calls to an alternate number
    • Foreign Exchange Station (FXS) lines:  Add lines that bypass the IP-PBX for fax, alarms or modems
    • Verified and non-verified account codes:   Control features and track costs 

  • With XO SIP Trunking Service, you can combine voice, data and Internet over a single IP connection and eliminate the need to buy separate circuits.

    Before SIP Trunking/After SIP Trunking

    Nationwide Coverage You Can Count On

    With more than 1.5 million business VoIP customers and “top provider” honors from Frost and Sullivan and Infonetics, XO Communications is your resource for SIP Trunking. XO serves 2,700 cities and 80% of the major metropolitan markets with VoIP and SIP Trunking services.  How may we serve your business?

    Contact XO today for a Free Consultation