Leverage your IP PBX across multiple sites

Looking to make the most of your PBX equipment? Our SIP (Session Initiation Protocol) Trunks delivers VoIP service — and its many advantages — through a dedicated IP connection to the Comcast network.

Bring reliability, scalability, and quality into the conversation with SIP trunking

When you want a flexible, intelligent way to maximize voice services on your PBX, our SIP phone service is the answer. This next-gen voice solution provides a virtual connection from all your IP and hybrid PBXs to the Comcast private network. Manage voice-line spend with trunk technology while you leverage your capital PBX investment at all your locations.

Business continuity

Includes continuity features to help keep your phone system available

Quality + security

Prioritizes voice services over other traffic and uses 2 layers of authentication to help secure the network


Allows as many or as few calling lines as needed. From 6 to 800 — and everything in between


SIP essentials you need

Do a lot of business nationwide? We take care of your calling needs. Our business SIP trunking solution comes with a total of 4,600 domestic long-distance minutes (200 minutes per channel). Plus unlimited local and intra-LATA (local access and transport area) calling, as well as other features.


Enhanced capabilities

When voice is vital for your multi-site business.

Continuity features to keep the phone lines open

When there’s a business or service disruption, SIP Trunks includes advanced business continuity features to support your phone system. Especially suited for organizations where high-availability voice is mission-critical, like call center operations or healthcare facilities.

Plan to keep communicating

Can’t afford to miss customer calls? Failover/Overflow helps make sure they go through by supplying additional bandwidth when there is an outage or when all lines are busy.

Optimize call traffic for efficiency

Help reduce call wait time and maintain agent productivity. Load Balancing routes a call to additional channels on other trunk groups until it’s answered.

Avoid congestion

Does seasonal demand causes spikes in voice traffic? Stay ready and accommodate excess traffic with Bursting to increase your call capacity.

Help calls go through

Sometimes, a trunk group is temporarily unavailable. Unreachable Destination automatically reroutes the calls to a designated 10-digit phone number at another site.


We have you covered for connectivity and communications

Comcast Business covers your bases, with a range of solutions that include Internet, phone, and TV services.

To start, get reliably fast Business Internet with speeds up to 1.25 Gbps. And while you’re in planning mode, stay ready with advanced cybersecurity that helps protect your connected devices.  

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The engine powering our solutions — and your business

More businesses rely on Comcast Business than on any other provider. Our solutions run on the largest converged IP broadband network in the nation.
Restrictions apply. Restrictions apply. Not available in all areas.  Limited to Comcast Business SIP Trunks 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. Actual speeds vary and are not guaranteed. © 2024 Comcast. All rights reserved.