olemus
(a) marsruutimine telefonsidevõrgus

https://plus.maths.org/content/call-routing-telephone-networks

https://voipstudio.com/en/how-voip-calls-are-routed/

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/8x/uc8x/ovroutng.pdf

(b) sisenevate kõnede sautomaatne haldus
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a call management process that automatically queues and distributes incoming calls based on a predefined set of rules and criteria

https://www.ringcentral.com/call-routing.html