Regarding transitions from older configurations to Secure SIP, what must be managed manually?

Managing Secure SIP certificates in devices is crucial when transitioning from older configurations to a more secure setup. This process typically requires manual intervention because certificates are often unique to each device and must be installed properly to ensure secure communication.

When setting up Secure SIP, it's necessary to generate and install the appropriate SSL certificates on the endpoints (like IP phones and softphones). This manual management guarantees that each device can authenticate the SIP server and establish secure communications, minimizing vulnerabilities associated with unencrypted traffic.

The other options pertain to different aspects of the transition. While user data could potentially be migrated automatically depending on the system's capabilities, SSL certificate deployment requires explicit attention to each device's configuration. Network settings for extensions and software updates, while important, are usually part of a broader automated system management strategy and do not inherently require the same level of manual oversight specific to Secure SIP certificate configuration.