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SIP Trunks

  • Simple, yellow icon depicting a check mark. Ideal for multi-sites
  • Simple, yellow icon depicting a check mark. Growth in single Concurrent Call Session increments
  • Simple, yellow icon depicting a check mark. Disaster recovery and business continuity

Make the right call: flexibility, scalability, and reliability

Looking to make the most of your onsite PBX? Here’s a solution to help protect that investment with the flexibility to manage your own equipment. Session Initiation Protocol(SIP) Trunking delivers Voice over Internet Protocol (VoIP) service through a dedicated connection from your IP PBX over one of the largest reliable IP backbone networks in the nation. And backs it up with Quality of Service and 24/7 business support.

Included with your phone solution

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Business Continuity

Keep your mission-critical phone system available with business continuity features

Simple, yellow icon depicting scalability.


Purchase the number of concurrent call session increments needed. Scale up as you grow.

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E911 Management

Let administrators easily manage the registered location of each line across their business or campus.

Ideal for these types of businesses

Take advantage of SIP trunking features that support business-critical functions.

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Corporate headquarters and large offices

When making and taking calls is the mainstay of your business, a fully featured phone system can be a big asset. 

Support inbound and outbound calling with:

  • Quality of Service
  • Unlimited local and low-cost long distance calling
  • Dialed Number Information Service, Automatic Number Identification
  • Unreachable Destination and Call Forward Not Reachable
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Organizations with customized business requirements

Some enterprises depend on having reliable, high-availability connections for their business phone service.

Features to address this need include:

  • Network Security
  • Failover, Bursting, or Load Balancing
  • SIP Gateway
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Franchised and multi-location enterprises

We can support a central site as well as local branches, hotel properties, stores, and other remote locations with PBXs deployed in a hybrid environment.

These features cover a wide range of needs:

  • Unlimited local calling minutes
  • Scalability
  • Redundancy
  • Unreachable Destination and Call Forwarding Not Reachable

Comcast Business phone solutions


Need help finding the right solution?

Just answer a few questions. We’ll recommend solutions for your business and show you some of our best offers available at your location.

Restrictions apply. Not available in all areas. Limited to Comcast Business Trunking Voice service. Minimum term agreement required. Equipment, taxes and fees extra, and subject to change. If there is a power outage or network issue, calling, including calls to 911, may be unavailable.