Office 365



Skype for Business Solutions Available Through O365


Cloud PBX is Microsoft's technology for enabling call control and PBX capabilities in the Office 365 cloud with Skype for Business Online. Skype for Business Cloud PBX allows you to replace your existing PBX system with a set of features directly delivered from Office 365 and tightly integrated into the company’s cloud productivity experience.

With Cloud PBX, your users can use Skype for Business Online to take care of basic call control tasks, such as placing and receiving calls, transferring calls, and muting and unmuting calls. Cloud PBX users can click a name in their address book, and Skype for Business places a call to that person. To place and receive calls, Cloud PBX users can use their mobile devices, a headset with a laptop or PC, or one of many IP phones that work with Skype for Business. For administrators, Cloud PBX provides the ability to manage calling within the same Tenant admin console used for messaging, collaboration, and so on.

As with traditional PBX systems and with Enterprise Voice, calls between users in your organization are handled internally within Cloud PBX, never going to the PSTN. This applies to calls between users in your organization located in different geographical areas, removing long-distance costs on these internal calls.

To enable calls to landlines and mobile phones, Cloud PBX can be connected to the PSTN in one of two ways:

  • By purchasing the PSTN Calling service add-on to Office 365.
  • By using on-premises PSTN connectivity, where software on-premises connects with your existing telephony infrastructure.


Cloud PBX solutions

The solution you choose to take advantage of Microsoft's Cloud PBX offering depends on your current and future needs, such as whether you want--or are required--to retain functionality provided by your on-premises deployment, whether you need features that are currently available only with your on-premises Enterprise Voice solution, and what your plan is for moving people to the cloud.


You can choose a completely-in-the-cloud offering, or you can choose a hybrid deployment that takes advantage of Cloud PBX, but keeps some functionality on premises. Depending on your needs, you can choose to have PSTN functionality provided by the Office 365 service or by your on-premises software--as shown in the following diagram and described in the sections that follow:


Cloud PBX


  • Cloud PBX with PSTN Calling service – This is the service plan you can add to Cloud PBX to enable calling to landlines and mobile phones around the world (depending on the level of service being licensed). Your users are homed in the cloud and are enabled for Cloud PBX with PSTN Calling provided by Microsoft. The PSTN Calling offering is an add-on to Office 365 that does not require an on-premises server deployment. PSTN Calling only works with Cloud PBX--you can’t use it with another PBX system.


  • Cloud PBX with on-premises PSTN connectivity – This option uses software on premises to connect your existing PSTN carrier, circuit, and contract with Office 365. Your users are homed in the cloud and are enabled for Cloud PBX, but their calling is processed through software on premises.


You continue to use your existing PSTN connectivity (either through a PBX, Gateway, Session Border Controller, or SIP Trunking connection) to source PSTN for the users who you move to the cloud. Once a user is moved to Skype for Business Online and Cloud PBX, their phone number will route to any of the Skype for Business clients for PCs or Smartphones as well as desk phones certified for Skype for Business. Once ported, Cloud and legacy PBX users can call each other normally as well as make and receive PSTN calls using their full phone number.

If you want to implement on-premises PSTN connectivity, you can choose from the following options:


    • Skype for Business Cloud Connector Edition - Cloud Connector is a hybrid offering that consists of a set of packaged Virtual Machines (VMs) that implement on-premises PSTN connectivity. By deploying a minimal Skype for Business Server topology in a virtualized environment, users in your organization, whether homed in the cloud are on premises, will be able to send and receive calls with landlines and mobile phones through the existing on-premises voice infrastructure.


    • Skype for Business Server existing deployment - An existing Skype for Business Server or Lync Server deployment can implement on-premises PSTN connectivity as well. This is a hybrid offering that consists of a Skype for Business Server on-premises deployment modified for hybrid PSTN. Users in your organization, whether homed in the cloud are on premises, will be able to send and receive calls with landlines and mobile phones through the existing on-premises voice infrastructure.


On-Premises PSTN connectivity with Cloud Connector Edition 


Cloud Connector is a set of packaged Virtual Machines (VMs) that implement on-premises PSTN connectivity with Cloud PBX. This hybrid offering is designed for organizations that want to enable their Skype for Business Online users to use their existing on-premises PSTN connection, with Skype for Business call control in the cloud.


With this option, you deploy a set of packaged VMs that contain a minimal Skype for Business Server topology--consisting of an Edge component, Mediation component, and a Central Management Store (CMS) role. These services are configured for hybrid with your Office 365 tenant that includes Skype for Business Online services.



On-premises PSTN connectivity with an existing deployment


You can implement a hybrid solution using your existing Skype for Business Server deployment and PSTN connectivity. In this topology, users are homed in the cloud on Skype for Business Online instead of being homed on the on-premises deployment. You can choose this option if you currently have users homed in the cloud or if you want to start migrating users to the cloud.


With this option, your Skype for Business Online users get their PSTN connectivity through Enterprise Voice on your on-premises Skype for Business Server deployment, with Skype for Business call control in the cloud.



Meeting Broadcast

Skype Meeting Broadcast enables organizations to host, produce, and broadcast a Skype for Business meeting on the Internet to up to 10,000 simultaneous attendees, who can view the broadcast from a browser on nearly any PC, Mac, tablet or smart phone. Skype Meeting Broadcast makes it easy to host large virtual meetings like internal “Town Hall” style meetings and public webinars.


PSTN Conferencing

PSTN Conferencing (PSTN: Public Switched Telephone Network) allows meeting attendees to dial-in to Skype for Business meetings from a phone, using a regular phone number. Presenters in the meeting can also dial-out to attendees and bring them into the meeting using their phone. Organizations can now consolidate conferencing solutions and simplify operations while reducing complexity for people, reducing support costs for IT and enabling employees to work from virtually anywhere.

  • Toll-Free Dial in and International Dial-out PSTN conference features will be available on a usage billed per minute basis.
  • Toll-free and International Dial-out conferencing capabilities may incur additional per minute consumption charges when available. Customers can disable this feature to avoid additional billing.
  • Consumption Billing enables customers to be billed for usage per minute at the tenant level, and enables PSTN Conferencing features like Toll-Free Dial-in and International Dial-out.
  • Consumption Billing will be available in H1 CY2016. Between PSTN Conferencing GA and the GA of consumption billing, customers will not have access to PSTN conferencing Toll-free Dial-in or International Dial-out.

This service will be program dependant (EA Direct and MOSP), billing options and pre-requisites to be advised



PSTN Calling – Available for Domestic and International

PSTN Calling works in conjunction with Cloud PBX in Office 365 to allow people to make and receive traditional business phone calls using a Skype for Business client on a smartphone, tablet, or PC, or using a compatible IP phone, nearly anywhere with Internet access. The PSTN Calling service from Microsoft is delivered entirely from the cloud, and includes both domestic and international calling. Organizations that subscribe to PSTN calling plans from Office 365, may port their existing phone numbers or get new ones.

This service is available in the United States Only at this time.


Unified Communications

Communication Solutions



Video Conferencing            Telphone Management  
Polycom            Proteus
Lifesize            TNG
Networking            VSA Rampage
Extreme Networks            SmartBoard Solution
RiverBed            Promethean
Networking Tools            Smart
Voice Recording           TouchIT
Amethyst            Room Management
SmartTap            Acoustics
             Call Centre