Zoiper is a cross-platform VoIP softphone solution that supports voice calling, video calling, and instant messaging. Zoiper is available for Windows, Mac and Linux and offers companion apps for iOS, Android, and Windows Phone. Zoiper secures voice, text, and video calls through a choice of several encryption protocols. Contacts are pulled from a variety of frequently-used contact lists and arranged in an easily searchable way. Additionally, Zoiper offers call center functionality with features such as auto-answer, call transfer, recording, provisioning, and click-2-dial CRM integration. One of the powers of Zoiper is its ability to facilitate direct calls from email clients or web browsers.

Note: This guide covers account configuration for Zoiper 5 Pro. Find free user license configuration instructions here.

If you're not sure what version is best for you, you can compare the free and pro versions here.

For Zoiper documentation, see:

Instructions for Configuring the All-New Zoiper 5 with Telnyx

Video Walkthrough

Coming soon! Check back frequently as we are updating our documentation.


  • Have created a credentials based connection on your Telnyx Mission Control Portal account, assigned this connection to a DID and outbound profile in order to make and receive outbound calls. This provides you with the username and password you will use to register Zoiper 5 with Telnyx

1. Configure your Telnyx Mission Control Portal

For step by step instructions on each of the requirements on the Telnyx Mission Control Portal, please follow this guide.

2. Create your VoIP account on Zoiper

  1. To activate your license, click Activate your Premium license and follow the instructions in the activation wizard. Note: Activation credentials are provided by Zoiper after you purchase your license. These are not your Telnyx credentials.

    If you don't have a license, you can continue as a free user.

    Activate a Zoiper 5 Pro license
  2. You will be taken to the login screen. Click Activate online. If you need to activate offline, see these instructions.

  3. You will be taken to the account creation wizard. Click Create account.

  4. Now, choose your location from the dropdown menu and select your country from the list. This will filter the available providers. Enter "Telnyx" in the next field to filter us out. Then select us as your provider.

  5. The wizard will automatically identify the proper protocols for your account. You'll see something like this. You can click Next.

  6. Once successfully authenticated, you'll have a new account on Zoiper 5. From here, you can set up your sound, video, and microphone settings (covered in this guide on page 16). Skip for now to confirm your account set up.

  7. If you click on the account name, you'll be taken to the account settings page.

If you want to configure more accounts in this manner, click the Add button and follow steps 3-6 again.

3. Activating Zoiper 5 Pro offline

If you experience difficulty with your internet connect, or are unable to bypass your company firewall or other security settings to reach the Zoiper server, you can activate your account offline.

  1. From the login screen, click Activate offline.

  2. This will generate a file named Zoiper<ComputerName>.certificate that contains information about your version of Zoiper and some details about your computer.

    1. If you have installed Zoiper for "all users", you can find the certificate folder within the \Zoiper5\ folder.

    2. If you have installed Zoiper for "the current user only", you can find the certificate folder in %USERPROFILE%\AppData\Romaing\Zoiper5 on windows or either ~/Library/Application Support or ~/Library/Preferences on Mac.

  3. Send Zoiper<ComputerName>.certificate to register5@shop.zoiper.com who will send you back a certificate back.

  4. Save this certificate in the same folder as 2.b.

Note: By default, Windows hides known file extensions and may automatically append a file extension to the file when its saved. When you find it, right-click on the file, choose Properties, and remove any extension that Windows automatically may have added.

4. Advanced setup and features

To adjust the advanced features of your Zoiper 5 account:

  1. Click on Advanced from your account settings view.

4.1. Audio Codecs

  1. From the Advanced settings, scroll down the page to the Audio Codecs section.

  2. From here, you can hover over any codecs on the left and use the arrows to move them to the right.

4.2. Network Settings

You can set your Zoiper 5 softphone to run all the time with the following steps:

  1. Scroll through the advanced settings page to the Network Related section.

  2. Apply the following changes:

    • Registration expire mode: Custom

    • Registration expiry: 300

    • NAT keep alive time-out: Custom

    • Keep alive custom interval: 30

4.3. Call Encryption TLS/SRTP

You can choose to use SIP TLS call encryption with your Zoiper 5 account. To do this:

  1. Make sure your account has Encrypted SIP Traffic enabled. Keep in mind that if this setting is enabled, but your device is sending UDP/TCP or RTP, this change will be rejected and you will get an error code (error code: 488). Enable this setting here:

  2. If you're encrypting a sub-account, you can enable this in Sub accounts>Manage sub-accounts>Advanced Options (click here to display)

  3. Once you've enabled this setting in your desired account(s), you can set it up to send TLS and SRTP.

  4. To enable TLS, find the SIP Credentials section in the Advanced section and fill in the following information:

    • Domain: sip.telnyx.com

    • Username: The name of your account/sub-account

    • Password: Your SIP password

    1. Scroll down the page to the Network Related section and set:

      1. Transport: TLS

  5. To enable SRTP, scroll to the Encryption section and set the following:

    1. SRTP Key Negotiation: SDES

Your account will now be secure. When you place a call, you will notice a green closed padlock next to your call profile, showing it's a secure call.

That's it, you've now completed the configuration of your Zoiper 5 (free version) softphone client and can now make and receive calls by using Telnyx as the SIP provider.

Additional Resources

Review our getting started guide to make sure your Telnyx Mission Control Portal account is set up correctly.

Check out the Zoiper 5 user guide

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