When using the LeadDesk robot calling, you can apply Voicemail detection time.
When a call is answered faster than this threshold (the applied amount voicemail detection time in seconds) then the call is considered to be answered by voicemail.
Example: the robot calls a customer and the phone is picked up in 3 seconds. This reaction speed is unusually high for a human. The threshold is 7 seconds, 3 seconds is less than 7 seconds, as such the call is considered a voicemail by the robot and not transferred to an agent.
The same ring time rules apply as in "ring time" settings, so finding a proper value here might depend on the operator. This is an alternative to Answering Machine Detection.
Please note that these two detection modes don't work simultaneously.