A randomized listing with companies, products or services using Kamailio. You are welcome to add new entries via submission form (click here).


IP telephony operator and MVNO in Germany.


Global MVNO and VoIP service, one SIM with multiple telephone numbers from different countries.


Scalable telephony platform build on top of Kamailio and FreeSwitch, with web interfaces for admins and users.

FhG Fokus

Open communications research and prototyping.

FhG Fokus Research Insititute

Greenfield Technologies

Real time communications solutions and services.

Greenfield Technologies

Nimvelo Phone

Internet phone service tailored for small businesses and start-ups, also having full REST API for integration with other services.

Nimvelo (Sipcentric Ltd)


Telecom services and systems.


Commercial Kamailio support, consultancy, and hosting.

LOD Communications, Inc.

Elastix – MT

Open source Linux distribution focused on VoIP and unified communications.

PaloSanto Solutions


SIP and Kamailio consultancy, trainings, support and development.

Asipto, Germany


Spanish telephony and unified communications provider.


A mobile communications service – voice, chat, sharing, …

Orange Vallee


Large VoIP?telephony provider in Norway and couple of other European countries.


Kamailio lies at the call processing core of CSRP, a high-performance SIP call routing, accounting, rating and LCR solution for SIP trunking providers, hosted PBX…

Evariste Systems LLC

Xtra Telecom

Spanish telephony provider focused on enterprise market, offering SIP trunking services along with hosted PBX’s

Core Network Dynamics

Solutions to access, control and services for mobile networks – EPC, IMS.

Core Network Dynamics


Enswitch is a full-featured multi-tenant softswitch for commercial telephony services such as hosted PBX, residential ITSP, SIP trunking, calling cards and more. It scales to tens of thousands of concurrent calls and hundreds of thousands of users on a full redundant cluster. It includes extensive hosted PBX features, prepaid and postpaid billing, invoicing, a web interface for system administrators, resellers, and customers, and a complete JSON API. It’s in production with carriers around the world, from single machine systems running tens of users to systems with several hundred thousand users. It’s also used by enterprises as a corporate PBX where high scalability and redundancy are required, especially across multiple sites.


Free SIP service since early 2000 with option to host personal domain.


PRIVISIP is a free (as in beer) TLS/SIP service for your endpoint, pbx, or other sip device. Powered by Kamailio.



Free SIP service with iNum and UK inbound numbers.

VoIP User Forum

Open IMS Core

Open source IMS core prototype implementation.


One of the largest IP telephony providers in Germany.


World wide DID market place.

DID eXchange

Thirdlane Cloud PBX

Cloud PBX platform.

Smile Telecoms

Smile provides 4G LTE mobile broadband services.

Smile Telecoms

Beneffy Telecom

US Based VoIP Phone Service Provider focused on Small Business and Enterprise Market, offering SIP trunking services along with hosted PBX solutions.


Second biggest telephony operator in Germany.


SBC products and SIP consultancy services.


Free SIP and WebRTC service – voice, video, instant messaging and presence.

SIP:Provider CE

Open source platform targeting IP telephony operators, embedding Kamailio, SEMS and Asterisk, packaged with billing system, web interfaces for administrators and subscribers.

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