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Wikipedia:
the process of selecting the path of outbound communications traffic based on cost

ülevaateid
https://en.wikipedia.org/wiki/Least-cost_routing

https://transnexus.com/resources/telecom-industry-topics/least-cost-routing/lcr-challenges

https://productdocuments.mitel.com/AEM/Business-Phone-Systems/MX-ONE/7.2/MiVoice%20Feature%20MX-ONE%20Feature%20Documentation/HTML5/20_1551-ANF90114.pdf