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!!! cdr.xls
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