• Reduce costs, simplify management, and enjoy the productivity benefits VoIP has to offer—while maximizing the value of your IT and network investments—with SIP Services from XO.

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  • Built on the foundation of your existing IP-PBX system, SIP Trunking lets you enjoy the benefits of unified communications. By bringing together your data, voice and Internet over your IP connection, you can increase productivity, reduce costs and improve network capacity.


  • For businesses with multiple locations and businesses with high bandwidth requirements, Enterprise SIP allows you to effectively leverage your existing systems to deliver VoIP across all locations and simplify management while also reducing costs.


  • Best-in-class high-speed IP network, broad geographic coverage, and all the services you need under one roof. Let XO help you focus your resources on your core business not your telecommunications.