# AbtoVoIPClient

> VoIP SIP softphone for voice, video, and text calls with SIP providers. (iPhone/iPad app by Sviatoslav Volodymyruvych Litynsky Private Enterpreneur.)

- Source: https://appshunter.io/ios/app/abtovoipclient/id527208668 (this page in markdown: same URL + `.md`)
- Developer: [Sviatoslav Volodymyruvych Litynsky Private Enterpreneur](https://appshunter.io/developer/329178119)
- Category: Utilities, Business
- Price: Free
- Rating: 4.50/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 12 MB
- Languages: English
- Released: 2012-09-13
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/abtovoipclient/id527208668/reviews.md

## What is AbtoVoIPClient?

ABTO Software's VoIP SIP softphone.
Can be used to call sip numbers and landline numbers (if sip provider has this option).

Features:
    voice calls;
    video calls;
    text chat (based on SIP MESSAGE request);
    works with all popual SIP servers, including Asterisk/FreeSwitch;
    make direct calls between clients without SIP server;
    allows to use UDP/TCP/TLS protocols for SIP transport;
    ability to make secure calls using SRTP/ZRTP;
    supports STUN/ICE;
    IPv6 support;
    CallKit - native incoming call UI and system integration of VoIP calls;
    2 simultaneous calls;
    call conferencing;
    attended transfer.

## Key features

- Voice calls
- Video calls
- Text chat
- Works with all popular SIP servers
- Direct calls between clients
- Secure calls using SRTP/ZRTP
- CallKit integration

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/abtovoipclient/id527208668/reviews.md

### 2/5 — Connection freezes when timer or alarm goes off

*2025-12-23, version 4.0*

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.

### 5/5 — Very useful

*2021-08-24, version 3.20*

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.

### 4/5 — Needs a bit more

*2021-05-06, version 3.20*

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.

## Frequently asked questions about AbtoVoIPClient

### 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.

## Version history (last 5 releases)

### 4.0 — 2025-09-04

- 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

### 3.20 — 2019-12-31

- DNS-SRV support
- Blind call transfer
- Audio route selection by user and initial autodetection (bluetooth, speaker, internal)
- Button press animations

### 3.11 — 2019-09-28

- adjusted app to look the same in black and white themes on iOS 13

### 3.10 — 2018-12-29

- added ability to make direct calls between devices in same LAN (without registration)
- improved video calls display, now app maintains aspect ratio of remote and local images

### 3.9 — 2018-08-11

- Added ability to establish TLS connection without verify servers cert (for demo purpose)
- Added link to manual on registration page
- Reduced time how long SDK is waiting to resolve public address via STUN 
- Fixed possible crashes related to STUN usage

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## More apps by Sviatoslav Volodymyruvych Litynsky Private Enterpreneur

- [abtoVNC Viewer](https://appshunter.io/ios/app/abtovnc-viewer/id560458255)
- [Abto multi account sip dialer](https://appshunter.io/ios/app/abto-multi-account-sip-dialer/id1611635906)

All apps by Sviatoslav Volodymyruvych Litynsky Private Enterpreneur: https://appshunter.io/developer/329178119

## Related topics

[abtovoipclient](https://appshunter.io/ios/topics/abtovoipclient) · [voppcioprtvcp](https://appshunter.io/ios/topics/voppcioprtvcp)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*