Linphone vs PortSIP Softphone

Linphone combines VoIP voice and video calling, instant messaging, and videoconferencing in one application. It uses SIP and SIP SIMPLE to interoperate with IP-PBXs, proxies, SBCs, and other SIP systems. Calling features include HD audio and video, call forwarding, concurrent calls, recording, DTMF, and Bluetooth headset support. Its Flexisip or SaaS conferencing option supports meetings with up to 50 participants and screen sharing. Messaging features depend on setup: Flexisip supports group chats, file sharing, read receipts, reactions, voice messages, and ephemeral messages; SIP SIMPLE provides basic one-to-one messaging with third-party accounts. Security features include SIP/TLS, SRTP, SRTP-DTLS, ZRTP, end-to-end encryption for exchanged media, and post-quantum encryption using CRYSTALS-Kyber. Flexisip can be hosted on premises and connected to an existing SIP server for group messaging and videoconferencing. Linphone is open source under GNU GPLv3, with proprietary licensing available for closed-source modifications. The app is available on Android, iOS, Linux, macOS, Windows, and web, with API and self-hosted options. Its free SIP service is for individual users and has no guaranteed support; paid support and maintenance are available by contacting the company.

PortSIP Softphone is a free app for Windows, iOS, and Android with browser calling and SIP support. It is the legacy app for PortSIP PBX v16.x; the maker directs users of PBX v22.x to PortSIP ONE. The broader PortSIP PBX offering brings calls, messaging, and meetings together, including call routing, SMS, WhatsApp, team messaging, contact center tools, and voice and video meetings. Contact center functions include skill-based routing, queue strategies, live wallboards, analytics, real-time monitoring, and training tools. The maker also describes AI features for call and voicemail transcription, notes, summaries, and sentiment analysis. PBX deployments can run on customer infrastructure, Azure, AWS, or GCE, in a cloud, data center, or on premises using Docker. Microsoft 365 integration supports user provisioning, single sign-on in web and native apps, and directory and contact syncing. The PBX Free Edition costs nothing and supports 3 extensions and 2 simultaneous calls. Paid PBX licenses require a quote and may be perpetual or annual.