Plan for SIP Gateway

SIP Gateway lets your organization use any compatible SIP device with Microsoft Teams to preserve your investments in SIP devices. Now you can sign-in to Teams with your corporate credentials and make and receive calls with a compatible SIP device. Compatible devices can be Skype for Business IP phones with standard SIP firmware, Cisco IP phones with multiplatform SIP firmware, or SIP devices from vendors such as Poly, Yealink, and AudioCodes. To find out how to configure your SIP devices for SIP Gateway, see Configure SIP Gateway.

Benefits of SIP Gateway

SIP Gateway connects compatible SIP devices to Teams to help your users migrate seamlessly to Teams telephony. Using SIP Gateway, your users can do all of the following:

  • Make calls: SIP device users can make calls to the Public Switched Telephone Network (PSTN), to other SIP devices, and to Teams and Skype for Business users. SIP device users can only call users who have phone numbers.
  • Receive calls: SIP device users can receive a call from the PSTN, from Teams or Skype for Business users who have SIP devices, and from Teams and Skype for Business client applications. The SIP device acts as a Teams endpoint. Inbound calls will also be forked to the user’s SIP device.
  • Multiple simultaneous calls: A SIP device user in a call can put the call on hold to make or receive other calls. A SIP device user can also conference two calls.
  • Do not disturb: A SIP device user can set do not disturb on the device so that the device will not ring for incoming calls. This has no impact on the user’s status on all other Teams endpoints.
  • Hold/Resume and Mute/Unmute: A SIP device user can hold and resume or mute and unmute a call by using the features for those actions on the device.
  • Voicemail: SIP device users can listen to electronically stored voice messages that callers leave for them.
  • Message waiting indicator: SIP device users can receive notifications that alert them when they have new voicemail messages.
  • Sign-in and sign-out: SIP devices users can sign in and sign out of Teams on the device.
  • Dual-tone multi-frequency: SIP device users can press number keys to provide input during interactive voice response calls.
  • Teams meetings: A SIP device user can join a Teams meeting by dialing the meeting access number. Dialing out to a same organization user’s phone number is currently not supported. However, guest users from another organization can be added to a Teams meeting by a participant who dials out to a guest user’s number to include that guest. NOTE: Adding a Teams meeting participant via “request to join” currently won’t alert a SIP device.
  • Call transfers: SIP device users can transfer calls. SIP Gateway supports both blind and consultative transfers.
  • Local call forwarding: A SIP device user can set forwarding rules (always, on timeout, and busy) for the device. If the device is connected to the SIP Gateway, then the call will be redirected to the target address based on the rule that the device user set. To make local call forwarding work, the admin must set the AllowCallRedirect attribute in Set-CsTeamsCallingPolicy to Enabled.

Requirements to use SIP Gateway

Teams users must have a phone number with PSTN calling enabled to use SIP Gateway.

Hardware, software, and licenses

If you have a 3PIP or SIP device, you must have:

  • A license for Phone System (via E5 or a standalone license)
  • PSTN enablement (i.e., a phone number) via a Microsoft Teams Calling Plan, Direct Routing, or Operator Connect
  • A Common Area Phone license for any common area devices

Compatible devices

Vendor Model Minimum firmware version Approved firmware version Remarks Links
Cisco Devices running enterprise firmware must be converted to multiplatform firmware. Read the guide at the right to learn how. Cisco firmware conversion guide
6821 11.1.1MPP 11-3-3MPP
7811 11.1.1MPP 11-3-3MPP
7821 11.1.1MPP 11-3-3MPP
7841 11.1.1MPP 11-3-3MPP
7861 11.1.1MPP 11-3-3MPP
8811 11.1.1MPP 11-3-3MPP
8841 11.1.1MPP 11-3-3MPP
8845 11.1.1MPP 11-3-3MPP
8851 11.1.1MPP 11-3-3MPP
8861 11.1.1MPP 11-3-3MPP
8865 11.1.1MPP 11-3-3MPP
Poly The device will auto-reboot and install the selected firmware.
VVX150 5.9.5
VVX201 5.9.5
VVX250 5.9.5
VVX300 5.9.5
VVX301 5.9.5
VVX310 5.9.5
VVX311 5.9.5
VVX350 5.9.5
VVX400 5.9.5
VVX401 5.9.5
VVX410 5.9.5
VVX411 5.9.5
VVX450 5.9.5
VVX500 5.9.5
VVX501 5.9.5
VVX600 5.9.5
VVX601 5.9.5
Yealink Yealink support
T40P 83
T41S 83
T41S 83
T41S 83
T42G 83
T42S 83
T42U 83
T43U 83
T46S 83
T46U 83
T48S 83
T48G 83
T48U 83
T53 83
T53W 83
T54W 83
T57W 83
T21P 83
T23G 83
T27G 83
T29G 83
T30 83
T30P 83
T31G 83
T33G 83
T40G 83
T41P 83
T46G 83
AudioCodes Some AudioCodes SIP devices need a provisioning URL setting. Download and install upgrade files for the affected AudioCodes devices at the right. Downloadable files for affected devices at AudioCodes
405 2.2.8
405HD 3.2.1
420HD 3.2.1
430HD 3.2.1
440HD 3.2.1
450HD 3.2.1
C450HD 3.2.1
445HD 3.2.1