troubleshooting Question

Use excel to count number of concurrent external calls

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colonialiu20Flag for United States of America asked on
Microsoft ExcelSpreadsheets
5 Comments1 Solution2497 ViewsLast Modified:
I am contemplating switching my company phone service from a traditional pri circuit to a virtual sip trunk.  I need to determine the maximum number of calls at any one time.  I have a spreadsheet (see attached) that contains start_timestamp, answer_timestamp, end_timestamp, destination, billsec, duration, and direction.  The time stamps are down to the second.  I'd like to calculate how many simultaneous calls are happening at any given time so I can order the correct amount of telephone lines from the phone company.  To complicate things, i do not need to count calls that are between internal 4 digit extensions.  For example, i do not need to count a call between 3876 and 3954.  I only need to count a call if either the caller or destination is an external number.  Ive googled around but cant find anything that does specifically this. Thank you!!!
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