Call whisper
Call whisper is a private audio message delivered to one call participant before or during a conversation without being audible to the other participant.
How call whisper works
The calling system creates an audio path that reaches only the intended recipient, usually a representative handling the call. It can play a prompt before the parties are connected or deliver guidance while the conversation is active. The private channel must remain isolated from the other participant's audio path.
Common messages include the source of an incoming call, a reminder about a required step, a suggested response, or context needed to handle an exception. A live whisper should be short and timed carefully. A long or unexpected message competes with the caller's speech and can make it harder for the recipient to listen, respond, and maintain a natural conversation.
Live call whisper is related to call monitoring but is not the same feature. Monitoring lets an authorized observer follow an active call. Whispering lets that observer or a system send private guidance into it, while a pre-connection whisper does not require live observation. It also differs from a warm-transfer briefing: a transfer briefing prepares a specific recipient to accept an active handoff, whereas a whisper can serve other routing or coaching purposes.
Why it matters for AI phone calls
In workflows that include a human representative, whispering can provide context without exposing internal instructions to the caller. A pre-connection message can identify the call's source or purpose. During a conversation, private guidance can surface a relevant policy, a risk signal, or context from earlier in the call. It can also help a supervisor intervene lightly before deciding whether to join or take over.
The feature needs clear boundaries. Private guidance may be wrong, late, or distracting, and the recipient should not be forced to follow it without judgment. Sensitive information should appear only when the recipient is authorized to receive it. Teams should also decide whether whispers are captured in recordings or transcripts, because that affects review, access, and retention.
Testing should verify audio isolation, timing, volume, and behavior during interruptions, transfers, and poor network conditions. The critical failure is not merely an inaudible whisper; it is private content leaking to the caller or masking something the caller says.