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Thank you very much Mohammed.
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When you use Office 365 for voice - I imagine your call setup is all done via client conversation to the MS PBX in their public cloud. But say you want to talk to someone in your own office a few doors down.. Do the real time packets flow to the MS cloud and then to your peer? Or would RTP flow straight from your client software to their client software over your LAN? And what if you want to talk to a co-worker in another city? Can O365 inform your client software to communicate directly between yourselves over the WAN? Or does RTP flow to the cloud and then out to the peer in the other city?
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When you use Office 365 for voice - I imagine your call setup is all done via client conversation to the MS PBX in their public cloud. But say you want to talk to someone in your own office a few doors down.. Do the real time packets flow to the MS cloud and then to your peer? Or would RTP flow straight from your client software to their client software over your LAN? And what if you want to talk to a co-worker in another city? Can O365 inform your client software to communicate directly between yourselves over the WAN? Or does RTP flow to the cloud and then out to the peer in the other city?

Office 365 for Voice - RTP Pathing

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).