Which configuration is critical for ensuring successful call routing in 3CX?

Successful call routing in 3CX heavily relies on the correct configuration of endpoint devices. Endpoint devices such as IP phones, softphones, and other telecommunication hardware must be properly set up to communicate effectively with the 3CX system. This includes ensuring correct SIP registration, handling the necessary network settings, and appropriate codec settings.

When endpoint devices are not configured correctly, calls may fail, experience poor quality, or not route at all, leading to potential disruptions in communication. Proper configuration includes assigning the correct extension numbers, ensuring that the devices are registered to the right server, and that they adhere to the necessary security protocols. As such, a well-configured endpoint creates a robust foundation for call handling and routing, facilitating seamless communication across the network.

In contrast, the other options, while they might have relevance in certain aspects of system functionality, do not directly tackle the foundational necessity of proper endpoint setup in the call routing process.