MicroSIP: A Lightweight SIP Softphone for Desktop Calling
MicroSIP is a lightweight SIP softphone that turns a desktop into a working telephone for any standards-compliant SIP account. You enter your provider or PBX credentials once, register the account, and the dial pad, contact list, and call history become your daily calling station. Incoming and outgoing calls travel over SIP, with DTMF support so you can navigate automated menus, plus optional messaging and presence so colleagues show as available or busy. Because it is built on the PJSIP stack, it interoperates with Asterisk, FreePBX, 3CX, and hosted SIP services instead of locking you to one vendor. The result is dependable desktop telephony that configures quickly and stays out of the way.
Setup is deliberately simple: configuration lives in a plain INI file, so a working profile can be copied to another machine or handed to a colleague instead of being rebuilt from scratch. The interface ships in many languages, supports right-to-left layouts, and works with screen readers such as NVDA, which matters in organisations where accessibility requirements are not optional. Codec support is broad, from Opus and G.711 to G.729, GSM, and Speex, so you can match a provider’s preferred order and keep speech clear on limited bandwidth. Teams comparing options often evaluate MicroSIP alongside Linphone, since both are open SIP clients that pair well with self-hosted infrastructure.
Benefits of Using MicroSIP
The main benefit of MicroSIP is that it delivers professional VoIP calling without the weight of a full unified communications suite. It uses very little memory and starts quickly, so it runs comfortably alongside browsers, spreadsheets, and remote desktop sessions on ordinary office hardware. Because it follows SIP standards and the PJSIP stack, it works with the infrastructure you already own, an Asterisk or FreePBX server, a 3CX instance, or a hosted SIP trunk, rather than forcing a migration. Security is available where it is needed, with TLS for signalling and SRTP for media, so conversations can be encrypted in transit. DTMF works in-band, through RFC 2833, or over SIP INFO, which keeps automated menus reliable. Several accounts can be stored and switched, video calling is supported with common codecs, and the portable configuration makes setting up a new desk a matter of copying a file. For support desks, remote workers, and small businesses, that combination keeps telephony simple, predictable, and inexpensive to maintain.
MicroSIP Software Information
- Developer: www.microsip.org
- Current Version: 3.22.16
- File Size: 9 MB
- License: Open Source
- Language: en-US
- Downloads: Estimated 10K+
- Platform: Windows Desktop
System Requirements
- Processor: 2-core CPU
- RAM: 2 GB RAM
- Storage: 1 GB available storage
- Graphics / GPU: Not required
Visit the official MicroSIP website
MicroSIP Features
Standards-Based SIP Calling
Registering an account with a SIP provider or PBX lets you place and receive voice calls straight from the desktop, with dial pad, call history, hold, transfer, and mute always at hand. Because it follows SIP standards, the client behaves predictably on hosted services and self-hosted servers alike, and DTMF works in-band, via RFC 2833, or over SIP INFO for reliable navigation of automated menus.
Video Calls with Common Codecs
Video calling is supported using widely deployed codecs such as H.264, H.263+, VP8, and VP9, which keeps picture quality usable even when bandwidth is modest. That helps teams needing visual contact for client meetings, remote troubleshooting, or distance support without installing a separate conferencing application, while the same dialer still handles the audio-only calls that fill most of the working day.
Encrypted Signalling and Media
TLS encryption protects SIP signalling, while SRTP and DTLS-SRTP protect the audio and video streams, so call contents cannot be read while in transit. For organisations handling customer conversations or working over untrusted networks such as hotel and public Wi-Fi, this means standard VoIP security is available in the client itself rather than requiring an extra gateway, VPN, or appliance.
Broad Audio Codec Support
MicroSIP supports Opus, G.711 A-law and μ-law, G.722, G.723, G.729, GSM, AMR, AMR-WB, iLBC, Speex, SILK, and Linear PCM, and the preferred codec order can be arranged for each account. Matching codecs to a provider’s capabilities keeps speech clear on constrained links while avoiding wasted bandwidth, and WebRTC-based echo cancellation plus voice activity detection help suppress feedback and background noise on hands-free calls.
Messaging and Presence
SIMPLE messaging following RFC 3428 lets you exchange short text messages with other SIP endpoints, while presence support through RFC 3903 and RFC 6665 shows whether contacts are available, busy, or away. This turns the dialer into a lightweight collaboration tool for quick internal questions, and it also tells you whether a colleague is free before you interrupt them with a call.
Portable, Low-Resource Configuration
Settings are stored in a plain INI file rather than the system registry, so a working profile can be backed up, carried on portable storage, or copied to a replacement machine. The client uses minimal memory and has no external dependencies, which means it coexists easily with browsers, virtual desktops, and other business software on modest hardware and can be deployed to a new desk in minutes.
Accessible, Multilingual Interface
The interface is translated into numerous languages, supports right-to-left layouts, and works with screen readers such as NVDA, so users who depend on assistive technology can operate it independently. Adjustable audio device, ringtone, and hotkey settings let each desk tune the client to its own headset and workflow, which shortens training time in multilingual teams and busy contact centres.
MicroSIP Old Versions
Version 3.22.12 Updated: July 1, 2026 Download
Version 3.22.11 Updated: June 29, 2026 Download
Version 3.22.10 Updated: June 16, 2026 Download
Version 3.22.9 Updated: June 2, 2026 Download
Version 3.22.6 Updated: May 8, 2026 Download
Version 3.22.7 Updated: May 8, 2026 Download
MicroSIP FAQs
What is MicroSIP used for?
It is a desktop softphone that registers with a SIP provider or PBX and handles voice and video calls from the computer. Typical uses include office extensions on Asterisk, FreePBX, or 3CX systems, remote work extensions, and customer support desks that need a dependable dialer without adopting a full unified communications platform.
Do I need a SIP provider to use MicroSIP?
Yes. The softphone is a client, not a telephone service, so you need SIP credentials from a hosted provider or an extension on a PBX such as Asterisk, FreePBX, or 3CX. Once those credentials are entered and the account registers successfully, calls are carried through that provider or server.
Can MicroSIP make video calls?
Yes, video calling is supported with codecs such as H.264, H.263+, VP8, and VP9, provided the other endpoint and the SIP server also allow video. Many users still keep it configured for audio only, since voice calls consume less bandwidth and cover most everyday communication.
Does MicroSIP encrypt calls?
It supports TLS for SIP signalling and SRTP or DTLS-SRTP for media, so calls can be encrypted in transit when the provider or PBX supports those options. Encryption depends on the server configuration as much as the client, so check what your SIP provider offers rather than assuming every call is protected automatically.
How many SIP accounts can MicroSIP manage?
Several accounts can be stored and switched between, but only one registers actively at a time, so it is designed as a single-line desktop client rather than a multi-line attendant console. Organisations needing many simultaneous lines usually register the softphone as one extension and let the PBX handle the rest.
Is MicroSIP accessible with screen readers?
Yes, it is compatible with screen readers such as NVDA, offers a multilingual interface with right-to-left support, and lets you adjust audio devices, ringtones, and hotkeys. That makes it a practical choice in workplaces where accessibility requirements apply to communication tools.