tSIP is described as 'Lightweight portable SIP softphone with BLF and customizable keypad built with libre/librem/baresip BSD-licensed stack' and is an app in the Social & Communications category. There are more than 10 alternatives to tSIP for a variety of platforms, including Mac, Windows, Android, iPhone and Android Tablet. The best alternative is Jitsi, which is both free and Open Source. Other great apps like tSIP are Linphone (Free, Open Source), MicroSIP (Free, Open Source), YakYak (Free, Open Source) and Zoiper (Free Personal).
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
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. Use Linphone for free, and enjoy its intuitive interface and advanced features with our free SIP service or with an existing SIP account.
Telephone allows you to make phone calls over the Internet or your company network. If your phone line supports SIP protocol, you can use it on your Mac instead of a physical phone anywhere you have a decent network connection.
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.
Thoughtfully designed, Bria 5 leverages over 10 years of softphone experience in improving productivity for our customers. Stay in your tool of choice and still have access to the power of Bria. Feel like you are in the same room regardless of where you are.
Walkie is a better way to communicate for distributed teams that don't want to spend all day in dry text channels. Voice Only A voice only communication tool that enables teams to communicate with emotion and purpose. Distraction Free