The segment of time used to calculate the cost of a phone call. IDT bills in six second increments. Other phone companies may bill in one minute increments.
A call duration measurement unit, expressed in seconds.
The billing increment tells how the long distance company rounds your calls for billing purposes. If a call is 20 minutes and 6 seconds, a company with 6 second increments will round to 20 minutes and 6 seconds A company with a one minute billing increment would bill the same call for 21 minutes.
a portion of time, usually one minute, used to measure and determine the cost of a telephone call. With a one-minute billing unit, the duration of calls is rounded up to the next full minute.
The time frame by which calls are charged. You might get charged by the second (which is a good thing) or charged in 30-second chunks (not such a good thing, because it means if you talk to someone for 31 seconds you have to pay for a whole minute).
The billing increment is how your service provider rounds your call durations for billing purposes. A 31 second call will be billed as a 1 minute call by a provider that has a per 30 second billing increment whereas a provider that has per second increments will only charge for the actual duration of the call i.e. 31 seconds.