---
title: "Which providers and platforms work with Groundwire?"
topic: "Compatibility"
updated: 2026-07-09
canonical: https://acrobits.net/resources/knowledge-base/groundwire-compatibility/
summary: "Groundwire works with SIP-based VoIP providers and PBXs that expose SIP credentials. Supported providers include VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, and PhonePower; supported PBXs include 3CX, FreePBX, Asterisk, Cisco BroadWorks, Zoom Phone, and NetSapiens. Closed consumer platforms such as RingCentral, Google Voice consumer accounts, Vonage Home, Hushed, TextNow, and OpenPhone do not expose SIP credentials, so they are not supported."
---

# Which providers and platforms work with Groundwire?

> Groundwire works with SIP-based VoIP providers and PBXs that expose SIP credentials. Supported providers include VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, and PhonePower; supported PBXs include 3CX, FreePBX, Asterisk, Cisco BroadWorks, Zoom Phone, and NetSapiens. Closed consumer platforms such as RingCentral, Google Voice consumer accounts, Vonage Home, Hushed, TextNow, and OpenPhone do not expose SIP credentials, so they are not supported.

**[Groundwire](/sip-client-ios-android/)** works with SIP-based VoIP providers and PBXs that expose SIP credentials. Supported providers include VoIP.ms, Twilio, Vonage Business, Telnyx, Bandwidth, and PhonePower; supported PBXs include 3CX, FreePBX, Asterisk, Cisco BroadWorks, Zoom Phone, and NetSapiens. Closed consumer platforms such as RingCentral, Google Voice consumer accounts, Vonage Home, Hushed, TextNow, and OpenPhone do not expose SIP credentials, so they are not supported.

## Supported VoIP providers

  - **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 standard 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**: third-party softphones cannot register because the platform does not expose public SIP credentials.

  - **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 help calls ring when the app is backgrounded.

  - **Network:** Wi-Fi and 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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