Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.
Wire vs Zoiper opinions
Wire does not do SIP. Zoiper is a SIP softphone
no SIP with is the base for VOIP
Zoiper allows you to call a regular phone number using a standard VoIP service (SIP or IAX) - the other person doesn't have to use Zoiper.
Main funcionality from Zoiper: SIP. It's not supported by Wire
Wire doesn't do SIP which is what Zoiper does.
They're completely different things. Zoiper does SIP and IAX. Wire is a proprietary setup.
Zulip is a group chat app in which messages are threaded by topic, helping you have long-running, organized conversations. Zulip's threading makes it easy for people not always on chat (like managers, remote team members, contractors, part-time workers, etc) to weigh in on...
Zulip vs Zoiper opinions
Zulip is not a SIP client
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Linphone vs Zoiper opinions
Linphone is quite half-baked if you do not use their full system.
Video conversations with up to 8 people in your browser - no downloads, no login. Just name your channel and you are on. Works in all modern browsers, even mobile.
The 3CX Phone System is the software-based private branch exchange (PBX) Phone system based on the SIP (Session Initiation Protocol) standard and enables extensions to make calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services...
Phoner provides business owner, sales people, lawyers, doctors, police officers and others with a second phone number to protect their identity and also gives the convenience of multiple phone numbers on one device.
With a superbly designed and intuitive user interface, the softphone offers easy set up with lots of preconfigured VoIP providers built in and smart call management features. Enjoy high quality enterprise communication features with zero effect on battery life.