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Erlang C

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  • 10th May 2000 at 08:57 #32665
    Mark
    Guest

    I am designing an IVR system for customer. The ultimate capacity for the system can be scaled to handle 80% of the 60,000 calls (in peak 15 minutes) within 20 seconds. Average call duration is 1.5 minutes. I try to use the on-line Erlang C calculator, but the maximum call per hour that I can input is 10,000 calls only. My requirement seems to be 60,000 x 80% x 4 = 192,000 calls per hour. Can anyone tell me how many IVR ports are required ?

    20th October 2000 at 22:14 #32666
    Christophe LAURENT
    Guest

    Have you got an answer ?

    I have the same proble with another datas.

    I don’t know how to caluclate how many IVR ports I need.

    I have 1200 calls per hour, I know each call is going to stay 40 seconds under the IVR, and I have 35 agents.

    I would like to knwo how many ports I need.

    21st October 2000 at 03:50 #32667
    Mark Li
    Guest

    I am happy to let you know that I finally win this job. I beat down IBM, Periphonic, Voicetek, Intervoice.

    For your situation, you first use Erlang B to calculate the IVR port. That is 1,200 mutiply 40 seconds then divided by 3,600 seconds. Then you have to assmue what % of these IVR ports will transfer to your agents. Then you can use Erlang C to calculate how many agents are required. You need to input in Erlang C the average waiting time for an agnet to answer.

    You can also work in the opposite manner by the 35 agents. Then you answer to call volume may not be 1,200 calls per hours. Hope it can help. If no. I can work it out for you.

    Mark

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