Microsoft Teams Calling on Legacy PBX phones with SIP Gateway

Microsoft Teams Calling on Legacy PBX phones with SIP Gateway

As a result of many organizations with existing investments in legacy PBX phones, Microsoft announced that SIP Gateway is now available. This is a solution that enables core Microsoft Teams functionality on compatible SIP phone models from Cisco, Poly, Yealink, and AudioCodes. This capability will help customers leverage their existing telephony hardware as they move to Microsoft Teams Phone System.

Currently, SIP Gateway supports the following core Teams calling functionality:

        • Inbound and outbound calls
        • Call transfer
        • Meeting dial-in and dial-out
        • Device-based “do not disturb”
        • Voicemail with message waiting indicator

Organizations meeting the following licensing requirements can use Gateway at no additional cost:

        • Users must be licensed for Teams Phone (via any Office 365 E5, Microsoft 365 license that includes Teams Phone, or as a standalone license)
        • PSTN enablement (i.e., phone number assigned) via a Microsoft Teams Calling Plan, Direct Routing, or Operator Connect
        • Common area devices require a Common Area Phone license

How to enable and manage Microsoft Teams SIP Gateway?

      1. Turn on “SIP devices can be used for calls” in Teams admin center and go to “SIP devices” under “Teams devices” to manage your SIP phones connected to Teams.
      2. Reset devices to factory settings and point them to SIP Gateway provisioning server.
      3. Ensure that your firewall is open to traffic from Microsoft 365 and Teams.
      4. Ensure that SIP devices are not behind a proxy.
      5. Open UDP ports 49152 to 53247, and TCP port 5061 for IP range to
      6. Onboarded SIP devices are visible in Teams admin center “SIP devices” tab after first sign-in.

If you are transitioning to Teams Phone, please book a meeting for personalized assistance. Our UC specialists can guide you through the efforts needed to optimize your Teams environment and make the most out of your investment.

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