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SIP Trunking Service Provider Partners

Covergence is continually forging partnerships with industry leaders to provide the most advanced solutions to enterprises. If you are interested in becoming a Covergence SIP Trunking Partner, contact alliances@covergence.com.



Provider Service Description

Verizon Business IP Trunking

Designed for global enterprises with a deployed IP PBX, offers inbound and outbound call routing to the PSTN.

AT&T IP Flexible Reach A managed VoIP solution that supports inbound and outbound calling on your data network giving you local, U.S. long distance and international reach for U.S. sites.

Level 3 Business Trunk Service

Offers high-quality, high-reliability local access for PBX equipment. Provides a variety of services to meet the requirements of customer PBX configurations

Time WarnerTelecom Direct SIP Trunk

Provides local and long distance PSTN termination and free site-to-site calling. Works with a customer-managed Cisco CallManager (CCM) or CallManager Express (CME) IP PBX system.

Global Crossing VoIP Outbound™

Supports national and international calling. VoIP is transported across Global Crossing's private VoIP platform for off-net TDM completion via the local public switched telephone network.

Gamma Telecom IP DirectConnect

Designed for global enterprises with a deployed IP PBX, offers inbound and outbound call routing to the PSTN.


SIP trunking provides a direct connection between an IP PBX deployed on a customer site and service providers IP network, eliminating the need to connect to the PSTN. Keeping calls on SIP from beginning to end will help unleash efficiencies that allow businesses to take advantage of the power of IP-based communications.


A SIP trunk includes multiple voice sessions – as many as the enterprise needs, but just as importantly SIP trunking can also serve as the starting point for the entire breadth of real-time communications and collaboration, including Instant Messaging, presence applications, whiteboarding and application sharing.