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Phone Extensions

Provide anyone with the ability to receive calls with an extension. Unlimited extensions and extension-to-extension calling included.

Phone number extensions

About extensions

Scalable calling capabilities for growing teams

Extensions enable callers to dial a company number and then enter a 3 to 4 digit extension to connect to a specific party. You can transfer calls to other extensions, create parking extensions, and dial other extensions internally.

Our license-free model enables you to add extensions without technical or financial restrictions, and our platform makes it easy to start calling from any device. Get expanded calling and routing capabilities, and easy, web-based configuration.


Add unlimited extensions to your company's phone system at no additional cost.

Virtual extensions

Enable people to work from anywhere with our web and mobile calling apps.


Add extensions in seconds, and assign permissions and departments.


Customize hold music, voicemail greetings, and individual call flows.

How it works

Adding extensions to your phone system

You can customize an extension for any user, and create unlimited users with Telzio at no additional cost. Creating an extension enables the user to be reached by other parties when dialing a company phone number. You can create a dial-by-name company directory, and enable callers to enter the extension during the greeting. Employees can reach each other and transfer calls to each other via extensions.



Is voicemail included with extensions?

Yes. Telzio extensions come with voicemail, voicemail transcription to email, text-to-speech greetings, and more.


Can I forward calls to a group of extensions?

Yes. You can create custom call flows and forwarding rules that  route calls to multiple extensions simultaneously.

Related features

100+ features included from day one

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Disruptive pricing

Scalable pricing with features and unlimited users included from day one.


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Personalized live product demonstration tailored to your organization and needs.