MicroSIP

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What MicroSIP is

MicroSIP is a desktop softphone for making voice and video calls over VoIP. It connects through SIP providers or PBX systems, and can also call an IP address or domain name directly. Its Call Manager handles multiple simultaneous calls, conference calls, blind and attended transfers, and instant messaging. The standard edition supports video; the Lite edition does not. Listed video codecs include H.264, H.263+, VP8, and VP9, while DTMF options include in-band, RFC2833, and SIP INFO. SIP signaling can use TLS, and media protection options include SRTP and DTLS-SRTP.

MicroSIP is free under the GNU GPL v2 license. The site lists Windows as supported and Linux, macOS, and BSD for use via Wine; Android, iPhone, and iPad are not supported. Standard and Lite downloads are available, each with a portable ZIP version. The project does not supply user accounts, phone numbers, or telephony services. Its site names Asterisk, FreePBX, 3CX, and SIP-compliant providers or servers as supported or commonly used infrastructure. Optional add-ons include browser extensions for detecting telephone numbers and CardDAV2MicroSIP; third parties develop and maintain them. Custom-branded Windows or portable builds start at €150, paid once, with later updates, modifications, or added features billed separately.

Who it suits

MicroSIP suits people who need a free desktop softphone for calls through a SIP provider or PBX, including users who need conference calling, transfers, or instant messaging. It may also suit organizations seeking a custom-branded Windows or portable build. It is not suited to people who need a supported Android, iPhone, or iPad app.

What it does well

Free desktop softphone licensed under GNU GPL v2.
Handles multiple calls, conferences, transfers, and instant messaging.
Supports voice and video calls through SIP or PBX systems.
Offers TLS signaling and SRTP or DTLS-SRTP media protection.
Standard and Lite editions have portable ZIP downloads.

What to know first

Android, iPhone, and iPad are not supported.
The Lite edition has no video support.
Custom-branded builds start at €150, paid once.
Support replies may be delayed or unavailable.

Plans

Plan	Billed and limits	Price
MicroSIP	Windows desktop SIP softphone · GPL v2	Free
Custom-branded softphone build	Single one-time payment; starting from €150 · Unlimited installations · Future updates, modifications, or additional features billed separately	€150, paid once

As microsip.org lists them, read 4 Oct 2026. The maker's own page has the final word.

Getting started

Visit the MicroSIP website.
Choose the standard or Lite edition from the downloads page.
Download its installer or portable ZIP version.
Connect through a SIP provider or PBX system, or call an IP address or domain name directly.

Verdict

Choose MicroSIP for free desktop VoIP calling with call management and video in the standard edition. Look elsewhere if you need a mobile app or telephony service included. Custom-branded builds are available for €150, paid once, with future changes billed separately.

Questions

Is MicroSIP free?

Yes. The MicroSIP plan is free, and the project identifies its license as GNU GPL v2.

Which platforms does it support?

Windows is listed as supported. Linux, macOS, and BSD are listed for use via Wine; Android, iPhone, and iPad are not supported.

Does MicroSIP provide phone numbers or calling service?

No. MicroSIP says it does not provide user accounts, phone numbers, or telephony services.

Does it support video calling?

The standard edition supports video, with codecs including H.264, H.263+, VP8, and VP9. The Lite edition has no video support.

Which SIP systems are named?

The site names Asterisk, FreePBX, 3CX, and any SIP-compliant provider or server as supported or commonly used infrastructure.

How much does a custom-branded build cost?

The listed starting price is €150, paid once. Future updates, modifications, or added features are billed separately.

Facts from MicroSIP's own pages

Add-ons: The add-ons page lists Chrome and Edge telephone-number detection extensions and CardDAV2MicroSIP, and says third parties develop and maintain them. · microsip.org, 4 Oct 2026
Call handling: Call Manager supports multiple simultaneous calls, conference calls, blind and attended transfers, and instant messaging. · microsip.org, 4 Oct 2026
Calling: It supports voice and video calls through SIP providers or PBX systems, as well as direct calls by IP address or domain name. · microsip.org, 4 Oct 2026
Custom builds: Custom builds are offered as Windows EXE and MSI installers or a portable version, with digitally signed builds listed as available. · microsip.org, 4 Oct 2026
Data protection: The website privacy policy states that it processes personal data under GDPR and that full payment card details are not stored by microsip.org. · microsip.org, 4 Oct 2026
Downloads: The downloads page lists standard and Lite editions, each with a portable ZIP version; it lists video support for the standard edition and none for Lite. · microsip.org, 4 Oct 2026
Integrations: The site names Asterisk, FreePBX, 3CX, and any SIP-compliant provider or server as supported or commonly used infrastructure. · microsip.org, 4 Oct 2026
License: The site identifies the project license as GNU GPL v2. · microsip.org, 4 Oct 2026
Media: The product page lists video codec support for H.264, H.263+, VP8, and VP9, plus DTMF support for in-band, RFC2833, and SIP INFO. · microsip.org, 4 Oct 2026
Platform: The site lists Windows as supported, Linux, macOS, and BSD via Wine, and says Android, iPhone, and iPad are not supported. · microsip.org, 4 Oct 2026
Privacy: MicroSIP says it does not provide user accounts, phone numbers, or telephony services and has no access to end-user information. · microsip.org, 4 Oct 2026
Product: MicroSIP is a lightweight Windows desktop softphone for business communication and professional VoIP use. · microsip.org, 4 Oct 2026
Security: The product page lists TLS encryption for SIP signaling and SRTP and DTLS-SRTP for media protection. · microsip.org, 4 Oct 2026
Support: The contact page says the team answers user questions when possible but may not have time to reply to all inquiries, so replies may be delayed. · microsip.org, 4 Oct 2026

Where MicroSIP stands on Freedom251

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