Groundwire: VoIP SIP Softphone

Acrobits, s.r.o.

About this app

Groundwire: the SIP softphone for your PBX or VoIP provider

Groundwire is a SIP softphone app from Acrobits, a leader in VoIP and communication software since 2009. It delivers clear voice and video calls for personal and professional use, with an interface built for daily calling and none of the clutter.

IMPORTANT, PLEASE READ

Groundwire is a SIP client, not a VoIP service. You need service from a VoIP provider or PBX that supports standard SIP clients.

Business calling features

Groundwire carries the call handling you expect from a desk phone:

- Group calls, for conferencing several people into one conversation.
- Attended transfers, so you can announce a caller before handing the call over.
- Unattended transfers, when the caller just needs the right extension.
- Voicemail with notifications, so a missed call still reaches you.
- Instant messaging, for the things that do not need a call.
- Per-account settings, so one device carries several SIP identities cleanly.

Works with your PBX or VoIP provider

Groundwire is a universal client and true VoIP for PBX users. Teams run it as an Asterisk softphone, a FreePBX extension, or a 3CX endpoint, and it connects just as readily to hosted PBX systems and business phone providers. It also comes preconfigured for major providers, so setup takes minutes. Because it is a standard client, there is no lock-in: bring the account you already have, and Groundwire becomes the mobile extension of your PBX, with encrypted SIP calling on every network.

On a team it is the business softphone dialer sitting on top of the PBX you already pay for. On your own it keeps a work line separate, or carries a desk extension in your pocket.

Key features of the softphone

- Audio on widely used codecs, Opus, G.729 and G.711 among them.
- Video calls at 720p HD, carried by H.264 and VP8.
- Private conversations with military-grade encryption, including TLS, SRTP, and ZRTP.
- Low battery use thanks to efficient push notifications.
- The VoIP dialer hands calls over between WiFi and mobile data without dropping them.
- Custom call settings and ringtones per account.
- 5G ready and compatible with most mobile operating systems.

Enjoy calls that feel like a natural part of your Android phone. Groundwire works with Android's built-in calling features for a smooth, familiar experience, and routes audio intelligently between your phone, speaker, wired headset and connected Bluetooth devices. With your permission, it can also add Groundwire calls to the Phone app's Recents list, so your call history stays easy to find in one place.

A softphone app without the fees

Groundwire is a softphone for calling over WiFi and mobile data, with the business dialer features that usually cost a monthly fee. One payment, no subscription, nothing hidden: buy it once and it stays yours. Encryption sits inside that price rather than on top of it.

Run a call center, manage a fleet of extensions, or keep a dependable sip phone for a home office. The same app covers all of it, without extra tiers.

Download Groundwire and put a dependable SIP dialer on your phone, with Acrobits engineering and responsive support behind it.

Ratings and reviews

App seems full featured and the functionality is fine. I have occasional lockups with the app, especially when the battery is nearly drained. Feature and function-wise, the app gets 4 or 5 stars. The flip side is the battery use. If allowed to run in the background, the phone will burn through the battery. Further work on reducing the battery usage would be extremely helpful. That said, if you can get by with setting the app to not run in the background, you should be fine.

It works but it's not very user friendly. I can't even change the ringtone to differentiate between calls. It's stuck on call integration mode and u can't figure out how to change it. Every call looks like it's coming through my provider now. I'm revising my review. After reinstalling I was able to reset the call settings that were locked during the initial install.

I'm using this app with a private network, and it works flawlessly. But there is one behavior I wish I could change, and I haven't figured out how: The app keeps resetting the audio to speaker on every call. I always use a Bluetooth headset, and if I select it, it works -- for THAT call. I have to keep selecting it, and it's a bother. I'd like to set the Bluetooth as the default, and stay that way until I change it. I need that to give 5 stars. I've searched and can't find it.

What’s new

- Adding support for Android 16
- Made audio route switching more robust and reliable across diverse hardware setups
- Fixed an issue where incoming notifications could become stuck
- Fixed user still being in conference call after splitting it
- Added the option to export call history to a CSV file
- Fixed resuming held call from Android Auto
- Added allow diversion header switch to Groundwire settings