Looking for a GroundWire alternative? Compare Spanvox
GroundWire, from Acrobits, is an excellent premium softphone for power users. Spanvox is a provider platform rather than a personal app: white-label apps across iOS, Android and desktop, bridged to your PBX with no trunk, with push and SBCs run for you.
- No-trunk bridge
- Your own dev accounts
- BYOD SIP
- Free to try
Spanvox vs GroundWire, at a glance
| Spanvox | GroundWire | |
|---|---|---|
| Built for | Providers shipping a branded app to customers | Individual power users |
| Platforms | iOS, Android, Windows, Mac + BYOD SIP | Premium personal softphone app |
| Connect to your PBX | Registration bridge: no trunk or dialplan change | App; configure SIP accounts |
| Ships under your accounts | Your Apple & Google accounts, your APNs/FCM identity | Acrobits-published app |
| Push that wakes the app | Server-side registration + APNs/FCM, CallKit & ConnectionService | Strong push via the Acrobits service |
| Multi-tenant provisioning | Idempotent REST API, webhooks and CDRs | Personal app, no provider API |
| Platform & operations | Redundant nodes, GeoDNS, real-time observability, 24/7 NOC | Personal app |
Reflects Spanvox’s capabilities and publicly available information about GroundWire as of 2026. Verify current details with each vendor.
A managed platform, not just an app
The bridge model
Spanvox registers to your PBX like a softphone, so there is no trunk, no dialplan edit and no firewall change. You turn on a service, not wire up a backend.
Your own dev accounts
Apps ship under your Apple Developer and Google Play accounts with your own APNs and FCM identity, so the app and its push are entirely yours.
Push, explained
Reliable ringing is server-side registration plus VoIP push through CallKit and ConnectionService, an architecture we describe, not just assert.
BYOD SIP
Register desk phones, ATAs and third-party SIP clients alongside the branded app, on the same account.
API-first, multi-tenant
An idempotent REST API with webhooks and CDRs to provision tenants and endpoints, built for automation, not clicks.
Carrier-grade & transparent
Redundant nodes, GeoDNS and a 24/7 NOC behind the platform, with a free sandbox and per-seat pricing instead of a demo wall.
Carrier-grade under the hood, watched around the clock
The parts that decide whether you can build a business on us: a globally redundant network, real security, and a team that never sleeps. Serious infrastructure for serious operators.
Globally redundant node pool
Registrations and calls run on a pool of redundant nodes across regions, on an anycast backbone. There is no single point of failure: if a node degrades, traffic shifts the same second.
GeoDNS routing & failover
GeoDNS steers every device to the nearest healthy node and reroutes automatically on failure, so latency stays low and outages stay invisible to your customers.
VoIP security, end to end
TLS and WSS signalling, SRTP and DTLS media, terminated on hardened Session Border Controllers. Credentials are encrypted at rest and never exposed to the device.
Toll-fraud protection
Per-endpoint concurrency caps, registration rate-limiting and automatic IP banning contain abuse before it ever reaches a bill, the number-one worry for any ITSP.
Observability as standard
A real-time view of every registration leg, live device, call and CDR with MOS scoring. It ships with the platform, not as a paid add-on.
24/7 NOC
A network operations centre watches the platform around the clock, with proactive response, so problems are caught and fixed before your customers ever feel them.
GroundWire alternative, answered
What is a GroundWire alternative for service providers?
GroundWire is a personal softphone. Providers who need to ship a branded app to many customers, bridged to their PBX, with multi-tenant provisioning, choose a platform like Spanvox instead.
How is Spanvox different from GroundWire?
GroundWire is a premium app a person points at their own SIP account. Spanvox is the platform behind a branded, multi-platform app: it bridges to your PBX with no trunk, runs server-side registration and push, and provisions tenants and endpoints through an API.
Does Spanvox ring as reliably as GroundWire?
Yes. Like GroundWire, Spanvox uses server-side registration plus VoIP push, surfacing calls through CallKit and ConnectionService so they ring even when the app is asleep.
Can the app ship under my own brand and accounts?
Yes. Apps ship under your Apple Developer and Google Play accounts with your own APNs and FCM identity, across iOS, Android, Windows and Mac.
When might GroundWire be the better fit?
If you personally want a top-tier softphone to point at your own SIP account, GroundWire is excellent. Spanvox is for providers who want to ship a branded multi-platform app to customers, bridged to a PBX, as a managed service.
Try the alternative, free
Stand up a branded app and BYOD endpoints against your existing PBX, free, on one SIP domain. Move at your pace.