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What is a Phone Extension?

An extension is a unique identifier of a phone or feature on a VoIP network. Some features may need an extension. Every user needs either an extension or a phone number, although they can have both.

Any phone with only an extension cannot have a unique e911 address. Instead if they dial 911, they provide the address to their default office location.

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For every industry, there’s a Nextiva solution

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Deliver end-to-end personalized experiences at scale

What is a Phone Extension?

See why 100,000 companies trust Nextiva for VoIP service.

I'm a big fan of companies like Nextiva.

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I’m a big fan of Nextiva

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