OpenSIPS

Open-source SIP proxy and server for voice and video

About OpenSIPS

OpenSIPS is an open-source SIP proxy and server used to build voice, video, instant messaging and presence services. Carriers, telecom operators and ITSPs deploy it for class 4/5 residential platforms, trunking, enterprise and virtual PBX setups, session border controllers, application servers and call centers. It is known for very high throughput, a flexible routing script for custom logic, and more than 120 modules covering SIP handling, back-end integration and advanced routing features.

OpenSIPS website preview

Live preview of opensips.org via the WordPress mShots service — it can take a few seconds to generate on a first visit.

OpenSIPS: strengths & things to check

Strengths

Completely free to use — this directory lists no paid plan for it.
Covers sip, voip, telephony, open source, server — see the focus areas listed in its key facts.
Has 6 close alternatives in the same category on this page, so switching or comparing is easy.

Things to check

Free tools can change their model or shut down — avoid locking critical work into it without an export path.
Current plan prices are not listed here (they change too often to print reliably) — confirm the exact price on the official site.
It is one of 565 tools in the Communication & Collaboration category here — compare it against the alternatives below before you commit.

Derived from this listing's own data (pricing model, focus areas and category) — not a hands-on review score.

OpenSIPS pricing

Pricing model	Free — listed in this directory as a free tool, with no paid plan required to use it.
Free access	Yes — fully free
Current plan prices	Listed on the official site — prices change, so this directory links out instead of printing a number that may already be stale.
Official site	opensips.org

OpenSIPS key facts

Category: Communication & Collaboration
Pricing: Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas: sip, voip, telephony, open source, server
Official site: opensips.org

OpenSIPS FAQ

How much does OpenSIPS cost?

Free — listed in this directory as a free tool, with no paid plan required to use it. Current plans and prices are listed on the official site (opensips.org).

What is OpenSIPS used for?

Open-source SIP proxy and server for voice and video Its focus areas in the Communication & Collaboration category: sip, voip, telephony, open source, server.

Where can I try OpenSIPS?

On its official site, opensips.org — the Visit Official Site button above goes straight there.

OpenSIPS vs alternatives

	OpenSIPS	Asterisk	FreeSWITCH	Kamailio
Pricing	Free — listed in this directory as a free tool, with no paid plan required to use it.	Free — listed in this directory as a free tool, with no paid plan required to use it.	Freemium — a free tier lets you start, and paid plans are available if you need more.	Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas	sip, voip, telephony, open source, server	voip, pbx, sip, telephony, open source	telephony, voip, open source, sip, self hosted	sip, voip, telephony, server
Official site	opensips.org	asterisk.org	freeswitch.org	kamailio.org
Directory status	Listed	Listed	Listed	Listed

Side-by-side from each listing's own directory data. Full alternative cards are below.

About the Communication & Collaboration category

Chat, video meetings, and messaging apps that keep teams connected. The Communication & Collaboration category on Tools Hub currently lists 565 tools. Alongside OpenSIPS, it includes Jitsi Videobridge, DavMail, Akkoma, MongooseIM.

FreeCommunication & Collaborationsipvoiptelephonyopen-sourceserver

Alternatives to OpenSIPS

Tools in the same Communication & Collaboration category that share focus areas with OpenSIPS — worth comparing before you commit:

Communication & Collaboration

Asterisk

Open-source IP PBX, VoIP gateway and conference server framework

Freevoippbxsiptelephony

Communication & Collaboration

FreeSWITCH

Open-source telephony platform for real-time voice and video

Freemiumtelephonyvoipopen-sourcesip

Communication & Collaboration

Kamailio

The open-source SIP server for large real-time communication services

Freesipvoiptelephonyserver

Communication & Collaboration

SIPCAPTURE Homer

Open-source VoIP and RTC capture, analysis and monitoring platform.

Freevoipsipmonitoringopen-source

Communication & Collaboration

Anveo

VoIP platform with visual call flow builder

Freemiumvoipivrsipcall-flow

Communication & Collaboration

Callcentric

BYOD VoIP service with pay-per-minute plans

Freemiumvoipsipbyodtrunking

More in Communication & Collaboration

Comparing tools in the Communication & Collaboration category? These related listings are worth a look: Jitsi Videobridge — Open-source WebRTC SFU for multiparty video applications; DavMail — Exchange gateway for standard mail and calendar clients; Akkoma — Magically expressive federated social media server software.