The Round Robin procedure distributes the calls in such a way that the ratio between the individual priority levels is always 2:1. Each time another "Round" is started, that round counter is applied to the "weight" of the remaining tasks.

The following example table assumes a configuration with 3 priority levels. There are 21 calls in the queue, with the following priority:

• 12 calls with priority 1
• 6 calls with priority 2
• 3 calls with priority 3

Following the 2:1 rule, the calls are queue over time t as follows:

1. Round 1: High Med tasks added in 2:1 ratio. No "Low" priority tasks in Round 1 as "Medium" task count outweighs the low task count.
2. Round 2: High Med Low tasks added in 2:1 ratio. The "Low" priority tasks get a round-multiplier added to their weight, now outweighing "Medium" tasks and thus are added in a 2:1 ratio.
3. Round 3: Same as Round 1.

🔍 Sources: Weighted Round Robin (Wikipedia Article). Please note that this example only works as long as no new calls are being processed. Calls with strict or no priority are not considered in this rule.

Legend:  Q: Calls in Queue | H: Handled | R: Remaining