What format must custom prompts be in for the Digital Receptionist announcements?

Custom prompts for Digital Receptionist announcements need to be in a specific format to ensure proper playback and optimal functionality within the 3CX system. Option B specifies MP3, encoded in PCM, at 8 kHz, 16 bit, and mono format, which aligns perfectly with the system's requirements for voice clarity and recognition.

The use of MP3 as a format is essential because it maintains a balance between audio quality and file size, making it efficient for telephony applications where bandwidth may be limited. The encoding in PCM ensures that the audio maintains a consistent quality, as PCM is a standard form of digital audio that provides uncompressed audio fidelity. The 8 kHz sampling rate is particularly suited for voice, as it captures the necessary frequency range that human speech occupies. Additionally, mono output is appropriate because telephony systems primarily utilize single-channel audio for clear voice transmission, avoiding confusion that dual or stereo channels could introduce.

This format ensures that the Digital Receptionist can deliver messages clearly and effectively to callers, adhering to the technical specifications set by 3CX for optimal performance.