Siphon SIP is described as 'Home of the World's first free SIP/VoIP application for iPhone and iPod Touch 1 and 2' and is an app in the Social & Communications category. There are more than 10 alternatives to Siphon SIP for a variety of platforms, including Android, iPhone, iPad, Android Tablet and Mac. The best alternative is Signal, which is both free and Open Source. Other great apps like Siphon SIP are Linphone (Free, Open Source), FluffyChat (Free, Open Source), Status (Free, Open Source) and Zoiper (Free Personal).
Signal is a messaging app with an unexpected focus on privacy, combined with all the features expected from a modern IM app. Signal has received a lot of praise from all around the world for its security and privacy-respecting technologies.
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.
FluffyChat is an open, nonprofit and cute matrix messenger app for Ubuntu Touch, Android and iOS. Open Opensource and open development where everyone can join. Nonprofit FluffyChat is donation funded. Cute ? Cute design and many theme settings including a dark mode.
Olvid, the most secure messaging app in the world. Olvid guarantees the total and definitive confidentiality of exchanges, relying solely on the mutual trust of interlocutors. For the first time, security does not rely on trusted servers.
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.