---
title: "Is Groundwire secure?"
topic: "Security & Privacy"
updated: 2026-05-04
canonical: https://acrobits.net/resources/knowledge-base/is-groundwire-secure/
summary: "Yes. Groundwire supports TLS for SIP signaling encryption, SRTP for media encryption, and ZRTP for end-to-end call encryption. SIP credentials are stored locally on-device. Push notifications are delivered via SIPIS without exposing call content."
---

# Is Groundwire secure?

> Yes. Groundwire supports TLS for SIP signaling encryption, SRTP for media encryption, and ZRTP for end-to-end call encryption. SIP credentials are stored locally on-device. Push notifications are delivered via SIPIS without exposing call content.

Yes — Groundwire supports three layers of encryption: **[TLS](/voip-glossary/tls/)** for SIP signaling, **[SRTP](/voip-glossary/srtp/)** for media (voice), and **[ZRTP](/voip-glossary/zrtp/)** for end-to-end call encryption. Together these protect your calls from registration through the audio stream.

## Encryption layers explained

  - **TLS** — encrypts SIP signaling (call setup, registration). Requires your VoIP provider to support TLS on port 5061.

  - **SRTP** — encrypts the audio stream between your device and your provider's server. Requires [provider support](/resources/knowledge-base/groundwire-compatibility/); most providers that support TLS also support SRTP.

  - **ZRTP** — end-to-end encryption negotiated directly between endpoints. Your VoIP provider does not hold the keys. Both sides of the call must support ZRTP; both Groundwire users get this automatically.

## Credential storage

Groundwire stores your SIP credentials locally on your device using the platform keychain — they are not uploaded to Acrobits servers. Push notifications are delivered via SIPIS, Acrobits' push infrastructure (in operation since 2009), without exposing call content.

→ See how to enable encryption step by step: [How do I enable encryption in Groundwire?](/resources/knowledge-base/how-do-i-enable-encryption-in-groundwire/)

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