The sound of silence and human speech: Being able to interpret this automatically is the key to an effective call center strategy for outbound calling success.
LumenVox Call Progress Analysis offers call center operators and predictive dialer developers the core technology to quickly and accurately classify whether calls were answered by a human or a machine. It accomplishes this with Voice Activity Detection (VAD). VAD is vital in creating effective predictive dialing solutions while complying with related regulatory restrictions governing the use of such automated systems.
Silence & Timing
There can be a varying amount of silence before someone begins speaking/ when a human answers a call. This silence needs to be taken into consideration by call flows, which means allowing some silence before speech, but also limiting the amount of time the application should wait for someone to speak. For instance, if no speech is detected after 5 seconds from the start of the audio stream, it is highly unlikely it was a human that answered. The ability to interpret this silence intelligently is critical to an effective call center strategy.
Speech & Timing
Once human speech has been detected, the next thing to determine is the length of that speech. Our extensive research has shown that statistically residential lines answered by a human have less than 1.8 seconds (1800ms) of speech in the greeting. That same research concluded that business greetings by humans are likely to be between this residential threshold and 3 seconds (3000ms). By extension, we can also conclude that anything greater than this should be classified as machine, likely a prerecorded message, possibly from an answering machine.
With the ability to classify and make these intelligent determinations, Call Progress Analysis can minimize the wait-time between calls handled by each agent, by predicting when the next agent will become available.
Not only can this contribute to significant operational cost savings for a contact center, but it also can dramatically impact the overall competitive advantage, since calls are being handled in a more efficient manner. This effective call center strategy and commercial advantage can be reflected as increased profit margin, more competitive pricing for customers or a combination of the two.