Which method can be used to provision remote extensions in 3CX?

Provisioning remote extensions in 3CX can effectively be done using HTTP or HTTPS URLs. This method allows remote devices to securely connect to the 3CX server from different locations over the internet. When a remote extension is configured to use a URL for provisioning, it can automatically download the necessary configuration settings, including SIP credentials, server information, and other parameters needed for the extension to operate efficiently.

This approach not only streamlines the setup process but also enhances security as HTTPS ensures that the configuration data is transmitted securely over the network. As a result, remote users can easily and quickly connect to the 3CX system without the need for complex manual configurations.

In contrast, other options, such as requiring direct network access or limiting provisioning to the local network, would not be suitable for remote extensions, as they would prevent users outside the local network from configuring their devices. Moreover, the option of provisioning via phone calls to customer support is not practical or efficient, as it would involve unnecessary delays and complexities compared to the automated and remote-friendly method offered by HTTP or HTTPS provisioning.