MicroSIP is Free VOIP (Voice Over IP) software that enables you to make secure, high-quality phone or video calls over the Internet. It supports direct point to point communication by IP address — ideal for connecting with other Micro SIP users at no cost. Alternatively, it can be used with a paid SIP service provider to call regular landlines and mobile numbers.
Free VOIP Software – MicroSIP (Portable)
Key Features of MicroSIP
- Free voice and video calls using SIP protocol
- Supports direct IP-to-IP calling
- Compatible with SIP providers for calling phone numbers
- Lightweight – under 19MB when extracted
- Portable – runs directly from a USB flash drive
- Settings stored in an .ini file for full portability
It is an open source solution ideal for tech-savvy users who need a simple, low-bandwidth, and portable VOIP client. It offers secure and high-quality communication with minimal system resource usage. Thanks to its portability, you can store it on an external device and use it on any compatible system without installation.
Specifications
Author’s Website: Project Page
Extracted Size: Less than 19 MB
License: Open Source
Supported Operating Systems: Windows 11/10/8/7/XP, Linux, Mac OS, BSD, and WINE
Rating: 4 Star
How to Run MicroSIP Portably from USB
- Download the portable version from the official site
- Extract the contents using 7-Zip or a similar tool
- Launch the application by running microsip.exe from the extracted folder
If you like this tool, you might also be interested in this handy alphanumeric phone number converter.
Note: MicroSIP is especially useful in low-bandwidth environments and is known for its low CPU usage, making it a great choice for older or less powerful machines.