---
title: "Which providers and platforms work with Groundwire?"
topic: "Compatibility"
updated: 2026-05-05
canonical: https://acrobits.net/resources/knowledge-base/groundwire-compatibility/
summary: "Groundwire is a standards-based SIP softphone — it works with any VoIP provider or PBX that exposes SIP credentials. Confirmed: VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, PhonePower, 3CX, FreePBX, Asterisk, BroadWorks, NetSapiens. Not supported: RingCentral, Google Voice consumer, Vonage Home, Hushed."
---

# Which providers and platforms work with Groundwire?

> Groundwire is a standards-based SIP softphone — it works with any VoIP provider or PBX that exposes SIP credentials. Confirmed: VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, PhonePower, 3CX, FreePBX, Asterisk, BroadWorks, NetSapiens. Not supported: RingCentral, Google Voice consumer, Vonage Home, Hushed.

**[Groundwire](/sip-client-ios-android/)** is a standards-based SIP softphone — it works with any VoIP provider or PBX that exposes SIP credentials. This page lists the providers and platforms most commonly asked about, with links to setup guides and known limitations.

## Supported VoIP providers (full setup guides)

  - **VoIP.ms** — [built-in preconfig](/resources/knowledge-base/how-do-i-set-up-groundwire-with-voip-ms/).

  - **Twilio** — [Elastic SIP Trunking with TLS + SRTP](/resources/knowledge-base/how-do-i-set-up-groundwire-with-twilio/).

  - **Vonage Business / SIP Trunking** — [VBC and SIP Trunking plans only](/resources/knowledge-base/how-do-i-set-up-groundwire-with-vonage/); Vonage Home is unsupported.

  - **Telnyx, Bandwidth, PhonePower** — see provider documentation

## Supported PBXs

  - **3CX** — Groundwire registers as a generic SIP extension.

  - **FreePBX / Asterisk** — standard SIP extension; supports multi-device registration alongside desk phones.

  - **Cisco BroadWorks** — supported via standard SIP credentials.

  - **Zoom Phone** — supported via Zoom's SIP-registered device option (enterprise-tier feature).

  - **NetSapiens** — supported via standard SIP credentials.

## Not supported

  - **RingCentral** — closed ecosystem; no public SIP credentials for third-party softphones.

  - **Google Voice** — consumer accounts have no SIP access. SIP Link is enterprise-only and tightly scoped.

  - **Vonage for Home / Vonage Box** — consumer plan has no exposed SIP credentials.

  - **Hushed, TextNow, OpenPhone** — proprietary apps; no SIP layer.

## Standards Groundwire supports

  - **Signalling:** SIP over UDP, TCP, TLS 1.2+

  - **Media:** RTP, SRTP (AES-128/256), [ZRTP for end-to-end](/resources/knowledge-base/how-do-i-enable-encryption-in-groundwire/)

  - **Codecs:** G.711u (PCMU), G.711a (PCMA), G.722, G.729, iLBC, Speex16, Opus

  - **DTMF:** RFC 4733 (out-of-band), in-band

  - **Call control:** SIP REFER (transfer), 3-way conference, hold, attended/blind transfer

  - **Push:** Groundwire uses SIPIS, Acrobits' push infrastructure (operational since 2009), to ensure calls ring even when the app is backgrounded.

  - **Network:** Wi-Fi ↔ cellular handover without dropping calls

## Common compatibility questions

  - **Does Groundwire work with my SIP server?** If your server speaks standard SIP and exposes credentials, yes. If you can register a desk phone (Cisco, Yealink, Polycom) against it, you can register Groundwire.

  - **Multi-account?** Yes — run multiple SIP accounts in parallel (e.g. work PBX + Twilio second line + VoIP.ms personal).

  - **iOS and Android?** Both, with feature parity. One purchase covers both.

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