Configuring SIP phones for Teams SIP Gateway

While native Microsoft Teams phone devices provide the richest and most complete Teams experience, there are still many organizations with existing investments in legacy devices. To help these organizations leverage their existing legacy telephony hardware as they move to Teams Calling, Microsoft has launched the Teams SIP Gateway, a free cloud service that enables core Teams calling functionality on compatible SIP phone models from Cisco, Poly, Yealink and AudioCodes. This blog article describes the pre-requisites and steps on how to provision SIP phones for Teams calling using this new SIP Gateway. For detailed info, refer to the official MS Docs site.

Pre-requisites

1. Users must be licensed for Teams Phone (via Office 365 E5, Microsoft 365 E5 or other plan with an add-on Phone System license)
2. PSTN enablement (i.e., phone number assigned) via a Microsoft Teams Calling Plan, Direct Routing, or Operator Connect
3. Common area devices require a Common Area Phone license
4. Supported Poly Phones: VVX150,201,250,300,301,310,311,350,400,401,410,411,450,500,501,600,601
5. Ensure that the corp firewall is open to traffic from Microsoft 365 and Teams
6. Ensure that SIP devices are not behind a web proxy
7. Open UDP ports 49152 to 53247, and TCP port 5061 for IP range 52.112.0.0/14 to 52.120.0.0/14

​Turning on SIP Devices support on the tenant

1. Navigate to Voice->Calling Policies and edit the Global policy or other specific policy
2. Turn on “SIP devices can be used for calls”

​Click save to proceed. Note that it may take several minutes for the changes to take effect.

Phone Setup

1. Set Base Profile to Generic
2. Specific Provisioning Server HTTPS URL configured for tenant either manually, CFG file, or DHCP Option 160. Eg: 

1. For each SIP device, set one of the following SIP Gateway provisioning server URLs:
   1. EMEA: http://emea.ipp.sdg.teams.microsoft.com
   2. Americas: http://noam.ipp.sdg.teams.microsoft.com
   3. APAC: http://apac.ipp.sdg.teams.microsoft.com
2. Save and allow phone to reboot and install necessary firmware automatically

If successfully provisioned, home page will show Teams logo with sign-in button:

​Phone Login
Login to phone using web sign-in and enter the PIN code shown on the phone. Then on a web browser navigate to https://aka.ms/deviceprovisioning and enter the code, Then sign in to Teams using user credentials:

Once successfully signed-in, start using phone for basic calling functions. For example, the picture below shows the VVX601 in a Teams call via the SIP Gateway:

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

1. Inbound and outbound calls
2. Call transfer
3. Meeting dial-in and dial-out
4. Device-based “do not disturb”
5. Voicemail with message waiting indicator

 
Comparing SIP Gateway to 3PIP Gateway to Native Teams
The table below summarizes the feature differences

It’s important to note that Microsoft will continue to support Skype for Business phones to sign into Teams via 3PIP Gateway beyond 2023. However, no new investments are planned for 3PIP Gateway, and 3PIP phones will be enabled via SIP Gateway after 3PIP Gateway end of life. No additional setup is needed for core functionality such as authentication, calling, calendar and presence, and meetings, using 3PIP phones.