Use Free SIP Accounts to Make Free Internet Calls

Session Initiation Protocol (SIP) is used in Voice Over Internet Protocol (VoIP) communications. It allows users to make mostly free voice and video calls over the internet. Having a free SIP account is a great way to make free calls. You begin by choosing a SIP provider that assigns you a ​SIP account at no charge. Use it with softphone software, an app, or a VoIP-compatible phone.

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OnSIP Free Plan

onsip website
What We Like
  • Plan includes 100 users with unlimited extensions; great for teams.

  • Slack and Zendesk integrations.

What We Don't Like
  • Application suite can be a bit byzantine to navigate.

  • Still some documentation updating after the GetOnSIP migration to the OnSIP Free Plan.

OnSIP is a paid VoIP service offered by Junction Networks. However, the company also offers the OnSIP Free Plan to people who want to create a free SIP address. The OnSIP Free Plan provides a web-based voice, video, and messaging solution for teams. The features include:

  • Up to 100 users.
  • Free SIP-to-SIP calling.
  • Custom web call links and HTML buttons.
  • Integrates with Slack and Zendesk.
  • Able to use as a Google Chrome extension.

The OnSIP Free Plan replaces the company's GetOnSIP program.

Visit OnSIP

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IPTel website
What We Like
  • Straightforward service portfolio.

  • Free for life.

What We Don't Like
  • No options for PTSN termination; it's SIP-to-SIP only.

  • Barebones website raises questions of how long the company will be around. provides IP telecommunications services and hosts several projects like the SIP Express Router, SIP Express Media Server, and the SIP Express Router Web. IPTel also provides a wealth of information on SIP communications on its website. The free SIP account IPTel offers is of good quality and is available with only a straightforward registration.

You are assigned a lifetime SIP account you can use to make audio and video calls with users of and other domains. You can access VoIP telephony services through web browsers without needing any special equipment, a SIP-compliant phone, softphone, or a smartphone app. 

Visit IPTel

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SIP 2 SIP website
What We Like
  • Free and easy to use.

  • Decent design.

  • Optimized for SylkServer.

What We Don't Like
  • Consumer-facing usage doesn't seem to be the developer's priority.

  • Separate apps for video and audio.

SIP2SIP is a straightforward SIP service offered by AG Projects. It is a free SIP service based on fair-use policy. Registration and account management are easy. AG Projects offers this free SIP service as one way for users to test the features present in its products. Using any of the compatible apps or clients you can:

  • Make audio and video calls.
  • Chat and transfer files.
  • Make conference calls.


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Antisip website
What We Like
  • Pure SIP-to-SIP provider.

  • Good documentation.

What We Don't Like
  • A few red flags; the official contact is in France and advertises his Gmail account.

The Antisip service offers a set of SIP-based services. Among them is a free SIP account that provides VoIP-to-VoIP services. The company recommends downloading its Antisip app for Android mobile devices, but the SIP account works with other devices. 

Links to YouTube tutorials are available at the website for users who are new to the SIP experience.

Download AntiSIP for Android

Visit AntiSIP

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