AgileIP

Direct inward dialing (DID), also called a direct number or direct dial-in (DDI), gives a specific extension its own external phone number. Outside callers reach that person or department directly, without going through the main number or the auto attendant. At AgileIP, a DID is offered as an Executive Direct Number and is available as an add-on.
https://agileip.ca/en/phone-system-pbx-features/direct-inward-dialing/

Multi-Line Business Phone Systems.
A multi-line business phone system lets multiple people in an organization make and receive calls simultaneously – each on their own call, using the same phone number infrastructure. For most Canadian businesses, this is the minimum viable phone setup: one business can handle several calls at once without anyone getting a busy signal.

https://agileip.ca/en/multi-line-business-phone-system/

Système téléphonique multi-lignes.
Un système téléphonique multi-lignes permet à plusieurs personnes dans une organisation de faire et de recevoir des appels en même temps – chacune sur son propre appel, en utilisant la même infrastructure de numéros de téléphone. Pour la plupart des entreprises canadiennes, c’est le minimum viable en matière de téléphonie : une entreprise peut gérer plusieurs appels à la fois sans qu’aucun interlocuteur ne tombe sur un signal occupé.

Multi-Line Business Phone System Multi-Line Business Phone System