Yes. You can deploy 3CX on your own servers (Windows or Debian) in a closed network and do not provide access to the Internet.

No. 3CX contains its own SIP server, Nginx web-server, reports and other modules and does not borrow code from Asterisk.

Yes, 3CX offers tools and support for PBX migration. You can import existing extensions, phone numbers, and configurations into 3CX, minimizing the disruption during the transition.

3CX takes security seriously and provides measures to protect your communications. It supports encryption protocols, such as TLS and SRTP, to secure calls and data transmission. Regular software updates and security patches are also released to address vulnerabilities.

Yes, 3CX has mobile apps for iOS and Android devices, allowing users to make and receive calls using their business extension from anywhere. It also offers web-based communication tools for remote collaboration and conferencing.