Yes, the use of CALLSTR is secure. CALLSTR uses peer-to-peer calls which means that data will only be transmitted between the website visitor and the website representative, not even CALLSTR has access to this data.
CALLSTR is DSGVO-compliant. CALLSTR does not save any data about website visitors. Only the website administrators can view encrypted browser data of the person calling.
For more information, use the contact form on callstr.com or get CALLSTR directly at callstr.com/register.