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Back in early 90's with Bell traditional phone and planned area codes (NPA) and central office codes (CO), we could route phone calls to the nearest support centers based on the area code and office codes.
Currently the SCP/IN of the cellular telephony networks take care of some features like this for personal number including forwarding based on time of the day.
Canada could have support offices located in NB and Vancouver, i.e. support time spanning 7:30am - 8pm ET. Based on the area code and CO of the callers, the (1-888) call center's software could route calls to the nearest or idle call support office.
Pizza order delivery could use this service to route call orders to the nearest shop from the (1-888) call center's software there.
Currently the CO codes were distributed or assigned randomly, thus the best possible routing would be based on area code (NPA).
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Reference by Wikipedia:
"The North American Numbering Plan is a closed numbering plan and prescribes ten digits for each complete destination routing code. A complete telephone number consists of three basic parts. The most significant part is a 3-digit Numbering Plan Area (NPA) code (area code). Each area code comprises a set of 3-digit central office (CO) codes, which are unique to each telephone exchange within an NPA. The remaining four digits are the specific station number assigned to each telephone."
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