Self-hosted / open sourceTelephony & VoIPHeadquarters: US

Rhino (Metaswitch / Alianza): sovereignty score and 8 European alternatives

Rhino is a telecom application server from Alianza for developing and running carrier-grade network services. Rhino TAS supports SIP, Diameter, SS7 and REST. Rhino SIP Servlet is a SIP Servlet 1.1 container, Sentinel VoLTE provides IMS-based VoLTE services, and Rhino VoLTE TAS is a telephony application server available as VM images. Rhino Element Manager offers web-based management, and Sentinel Express includes an SDK for building services.

Rhino was developed by Metaswitch, which Microsoft owned until Alianza completed its acquisition on 4 March 2025. Alianza is a US company; its announcements are datelined Pleasant Grove, Utah. Because Rhino is delivered as software for operators, where it runs and where subscriber data is processed depends on the operator's deployment. A European operator should weigh the vendor's US ownership when agreeing support, updates and access.

See the 8 European alternatives ↓Assess your stack with Rhino (Metaswitch / Alianza) pre-selected

Mastodon LinkedIn Bluesky X Email

Sovereignty score

57 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-210
Headquartered in the US: CLOUD Act and FISA 702
Data residency SOV-3100
Hosting inside and outside Europe (US, EU)
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-655
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 9, 2026

Headquarters	US (US)Verified by hand
EU adequacy decision	Only for companies individually certified under the EU-US Data Privacy FrameworkVerified by hand
Data hosting	Self-hosted, e.g. in US, EU (your choice)Verified by hand
Open-source	NoVerified by hand
GDPR-compliant	YesVendor-stated
Hosting signal	AMAZON-02 - Amazon.com, Inc., US (US)Technically measured
Category	Telephony & VoIP
Type	Product
Website	docs.rhino.alianza.com ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to Rhino (Metaswitch / Alianza)

The European alternatives to Rhino (Metaswitch / Alianza) come from our knowledge base of over 8,000 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

Is Rhino (Metaswitch / Alianza) one of many dependencies?

Score your whole stack in about three minutes. Free, no account needed.

Assess your stack →View a sample report (opens in a new tab)

Why digital sovereignty matters with Rhino (Metaswitch / Alianza)

Rhino (Metaswitch / Alianza) is headquartered in the United States. US vendors fall under the CLOUD Act and FISA 702: US authorities can compel access to data, even when that data sits in a European data centre. That is the core of the jurisdictional exposure in our model.

Rhino (Metaswitch / Alianza) 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.

Rhino (Metaswitch / Alianza) 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 Rhino (Metaswitch / Alianza) 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 Rhino (Metaswitch / Alianza)?

It depends on your use case. Strong EU alternatives to Rhino (Metaswitch / Alianza) include Kamailio, Wazo and 3CX. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to Rhino (Metaswitch / Alianza)?

Yes. Open-source EU alternatives to Rhino (Metaswitch / Alianza) include Kamailio and Wazo. These keep your data fully under your own control and let you self-host if you want to.

Is Rhino (Metaswitch / Alianza) GDPR-compliant and where is the data hosted?

Rhino (Metaswitch / Alianza) is headquartered in US and hosts data in US, EU. The vendor states it is GDPR-compliant, but the data falls under non-EU jurisdiction. For full EU data residency the EU alternatives on this page usually offer more certainty.

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 9, 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.

Also in this category

See all →

Open in the alternatives dashboard Missing a vendor? Submit it Are you this vendor? You can also become a sponsor on the Telephony & VoIP page — with no effect on your score