It is highly compatible with most PBXs and SIP providers [0.5.2].

Do you need help (like SpinTel ) once it is installed?

It is not the prettiest software on your desktop, but it is dependable. For IT administrators provisioning phones for a call center, or for a remote worker who needs a reliable connection without paying for a monthly subscription, Zoiper Free 3.15 remains a . It is the "Toyota Corolla" of softphones: not flashy, but it will get you to your destination reliably.