What are some alternatives?
When comparing Voxox CloudPhone and tSIP, you can also consider the following products
Line2 - Line2 adds a second phone number or complete cloud business phone system to smartphones & computers that's robust yet affordable. Buy online or get a custom quote.
YakYak - Desktop client for Google Hangouts
HulloMail - Read, play and manage voicemail and missed calls on your smartphone, PC, tablet & email.
Jitsi - Open-source video calling and chat platform.
YouMail - YouMail turns visual voicemail into a personal assistant for handling all your missed calls.
Telephone - Telephone is a VoIP program which allows you to make phone calls over the internet.