Accelerating Network

IP Optical Networking & Secure Cloud Communications

You May Not Know Our Brand, But You Know Us

Our heritage precedes us, but it does not define us. We leverage our experience to develop more reliable network solutions, as we continually innovate.

The Ribbon family has grown over the years, bringing together the best talent in our industry.  Our team’s innovative drive and deep engagement are vital to your success — and ours.

Microsoft Solutions - Teams Direct Routing

Direct Routing for Microsoft Teams - make and receive business phone calls

Organizations are already using Teams for video conferencing, file sharing, and chat. Microsoft Phone System Direct Routing is the service inside of Teams that allows organizations to connect external phone lines and use Teams as an office phone system.

Ribbon provides the Microsoft certified Session Border Controller (SBC) required to connect Teams to a telecom provider (aka phone lines). Teams uses IP-based voice connections, commonly referred to as SIP Trunks to connect to the rest of the world. Ribbon’s SBCs secure these connections and assure interoperability so organizations can select from hundreds of service providers across the globe.

Microsoft Solutions

Azure & AWS-Hosted SBC

Ribbon's Azure & AWS-Hosted SBC software securely connects Teams to an external telephone network, turning Teams into the office phone system.

Ribbon Connect

Ribbon Connect for Microsoft Teams direct routing makes it cost-effective to start a pilot or migrate key sales staff, or an office to Microsoft Teams.

Teams Service Assurance

Ribbons cloud-based EdgeView works with on-site EdgeMarc devices to monitor and manager network traffic, ensuring a consistent quality of service.


Analytics to proactively detect UC/CC network and service anonalies or threats, so you can avoid disruptions and the time and money it costs to fix them

What Do I Need to Get Started with Teams Calling?

Getting started is easier than you think, here are the 4 key requirements:

  1. Microsoft Phone System license in Microsoft 365 (typically included in the E5 package and an add-on for E3 – check your contract for details).
  2. A telecom provider that can provide SIP Trunks for Teams (AKA a dial tone provider). SIP Trunks are the industry term for what Microsoft calls Direct Routing. If you choose a new dial tone provider, you will need to either port your existing phone numbers to the new provider or get new phone numbers (the provider can offer details and timing for each option).
  3. A Microsoft-certified Session Border Controller to terminate the SIP Trunks (All of Ribbon’s session border controllers are fully certified). The SBC acts as a voice firewall and can mitigate interoperability issues.
  4. A trained staff member or an IT professional who can assist with the solution set-up.

What is the SBC’s Role in Direct Routing?

Microsoft requires a certified SBC to act as bridge between Teams and the telephone network. The session border controller provides multiple functions:

  • Security – it acts as a voice-aware firewall and encrypts traffic to protect the voice traffic itself and to prevent bad actors from entering the data network via the voice network
  • Interoperability – not every SIP Trunking provider is identical, Ribbon’s SBCs can adjust key parameters to make set-up easy and trouble-free
  • Legacy Connectivity – many organizations still have analog phones, elevator phones, door phones and fax machines. Ribbon’s hardware–based SBCs have analog ports (FXS) to keep these assets working for years to come
  • Migration – often organizations want to slowly migrate to Teams, keeping their legacy PBX in place for weeks or even months or years. Ribbon SBCs can provide simultaneous ringing so that both Teams and the old PBX share connectivity.
  • Resiliency or Failover – Ribbon SBCs support Microsoft’s Survivable Branch Appliance (SBA) to provide basic calling services even if the Microsoft 365 cloud is unreachable. Further, Ribbon supports WAN resiliency and several other options to manage disruptions in service, depending on the deployment model. These tools can keep your organization connected even if the unexpected happens.

Why Choose us?

Voznet stands as an accredited Official Partner of Ribbon Communications (formerly Sonus), offering comprehensive communication solutions across Pakistan. Our expertise encompasses Microsoft Teams Telephony, Session Border Controllers (SBC), and Office 365 PaBX Integration.

Covering major cities like Karachi, Lahore, Islamabad, Peshawar, Quetta, Gwadar, Sukkur, and Hyderabad, we ensure businesses nationwide have access to advanced communication technology.