EU Sovereignty Score
Self-hosted / open sourceTelephony & VoIPHeadquarters: BG

Zoiper: sovereignty score and 8 European alternatives

Zoiper is a SIP softphone for voice and video calls. It is installed as an application on the user's own devices, including mobile devices, and connects to SIP-based telephone systems and providers. It is proprietary software and not a hosted service. The vendor describes TLS, SRTP and ZRTP encryption for voice and video where the server or service provider supports it.

Zoiper is developed by Securax EOOD, a company organised under Bulgarian law with its registered office in Sofia, so the publisher is established in the European Union. Its terms are governed by Bulgarian law, with disputes handled by the competent court in Sofia. According to the privacy policy, Securax is the data controller for its website and software, processes personal data on its own or leased technical means located in Bulgaria, and refers to the GDPR. Calls themselves go through the SIP server or provider that the organisation connects, so the data-processing terms of that provider matter as well.

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Sovereignty score
80 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-380
    Closed source, but self-hostable: encryption keys and runtime under your own control
  • Freedom from lock-in SOV-640
    Closed source: switching requires data migration
  • Source & runtime sovereignty SOV-4 · SOV-680
    Closed source, but self-hostable on your own infrastructure

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 13, 2026
Headquarters
BG (EU)Verified by hand
Data hosting
Self-hosted, e.g. in EU (your choice)Verified by hand
Open-source
NoVerified by hand
GDPR-compliant
YesVendor-stated
Category
Telephony & VoIP
Type
Product
Website
zoiper.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Zoiper

The European alternatives to Zoiper come from our knowledge base of over 7,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

75 European Telephony & VoIP vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with Zoiper

Zoiper is headquartered in BG and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Zoiper runs on infrastructure you choose and control yourself. You decide where the data lives, including fully within the EU if you want — this is not a fixed hosting choice made by the vendor.

Zoiper is closed source, but you run the software yourself on your own infrastructure. The encryption keys and the runtime therefore stay under your own control, though you cannot audit or modify the source code. Ask about export options and open standards to limit software-level lock-in.

What this means for your organisation depends on your whole stack and context. The free assessment weighs Zoiper together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to Zoiper?

It depends on your use case. Strong EU alternatives to Zoiper include A1 Telekom Austria, Acrobits and Adversus. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Zoiper?

Our list of EU alternatives to Zoiper is mostly commercial options. Browse the category on the map for open-source choices.

Is Zoiper GDPR-compliant and where is the data hosted?

Zoiper is headquartered in BG (EU) and hosts data in EU. That makes Zoiper an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 13, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Digital sovereignty in Telephony & VoIP

Telephony & VoIP: Business telephony, VoIP platforms, CPaaS and communication APIs. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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8 European alternatives to Zoiper — GDPR-compliant & EU-hosted · EU Sovereignty Score