Free

Details

  • Released
  • Updated
  • September 13, 2012
  • September 4, 2025

Features

AbtoVoIPClient screenshot #1 for iPhone
AbtoVoIPClient screenshot #2 for iPhone
AbtoVoIPClient screenshot #3 for iPhone
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About

This application provides voice and video calling capabilities, along with text chat, for users with SIP accounts. It supports direct calls between clients and offers secure communication options. The app integrates with native iOS call features for a seamless user experience.

Voice calls
Video calls
Text chat
Works with all popular SIP servers
Direct calls between clients
Secure calls using SRTP/ZRTP
CallKit integration
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What's New in AbtoVoIPClient

4.0

September 4, 2025

- CallKit for VoIP calls integration with iOS: native incoming call UI, system become aware of VoIP calls, contact selected ringtone, etc - Multiple calls support: enabled 2 simultaneous calls - Attended transfer - Redesigned call screen - Minimum supported iOS version raised to 15 - Small fixes: IM suggestion table selection, IM screen on iPad, icons

More

User reviews

Connection freezes when timer or alarm goes off

I will be on an active session and every single time my alarm or timer goes off, the connection freezes, and doesn’t let me do anything without closing the app from the app switcher and starting over. Decide from that, it works great.

Very useful

Our team use the SDK of this team and it’s very useful.
In other order, we have an issue with IPv6 and T-Mobile with the SDK that can’t register.
If you can help us, will be a great help.
Best regards.

Needs a bit more

Great for my purposes. Needs speakerphone, dark mode, full size keypad on calls and to be able to hear the touch tones when you press them.

Developer apps

FAQ

What is AbtoVoIPClient?

AbtoVoIPClient is a VoIP SIP softphone that allows you to make voice and video calls, as well as send text messages, using your SIP provider. It is compatible with most popular SIP servers and offers secure calling options.

Can AbtoVoIPClient make calls to landlines?

Yes, AbtoVoIPClient can call SIP numbers and landline numbers, provided your SIP provider offers this functionality. This feature allows for broader communication reach beyond just other SIP users.

Does AbtoVoIPClient support secure calls?

Yes, AbtoVoIPClient supports secure calls using SRTP/ZRTP protocols. This ensures that your voice and video communications are encrypted and protected from interception.

How does AbtoVoIPClient integrate with iOS?

AbtoVoIPClient utilizes CallKit for native incoming call UI and system integration of VoIP calls. This means incoming calls will appear like regular phone calls on your iOS device, providing a familiar user experience.

What is the update frequency for AbtoVoIPClient?

AbtoVoIPClient was last updated on September 4, 2025, indicating ongoing development and support. The latest version is 4.0, released on September 13, 2012.

What devices is AbtoVoIPClient available on?

AbtoVoIPClient is available on iPhone, iPad, and iPod devices. It is designed to work seamlessly across these Apple platforms.

Does AbtoVoIPClient have ads?

No, AbtoVoIPClient does not contain advertisements. It is a free application without any in-app ads to disrupt your calling experience.

What is the user sentiment for AbtoVoIPClient?

AbtoVoIPClient has a high rating of 4.5 stars based on 2 ratings. This suggests a positive user experience among its current user base.