Call2Teams for Microsoft Teams - Wiki

Call2Teams for Microsoft Teams

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Call2Teams™ is a simple add-on to Office 365 that connects Microsoft Teams to any PBX or SIP Trunk in minutes allowing making and receiving calls on any device using the Microsoft Teams App.


Call2Teams Trunk


  • You need to make a temporary spare user licence on Office 365
  • Your sub account credentials and your DIDs number. (If you don't have a sub account, you can create one under your Customer Portal under "Sub Accounts" then, "Create Sub Account" or use your existing sub account.)
  • Global Admin access to your Office 365 tenant

Set up the office 365 tenant

When you do your initial subscription to Call2Team you will receive an email with an invite you to login into the portal.

Call2Teams Invitation.png

You will need to use your office 365 login. (Be sure that the email comes from your organisation that you need to setup your Microsoft Teams with Call2Teams and have the global level access).

Call2Teams Initial Login365 usr.png Call2Teams Initial Login365 pwd.png

You will need to give call2teams the necessary permissions to operate it. You must check the box "Connect on behalf of your organisation", then click on the button [Accept]

Call2Teams Permissions requested.png

Configure your Call2Teams users

After giving the permissions by using a global admin email account. You will be redirected automaticaly to the Call2Teams Admin Portal. Now you need to create a new Trunk. To do so, click on the "Service" tab, where the upper navigation bar.

Call2Teams NAV Services.png

In this step, be sure you have your credentials of your Sub Account. (If you doesn't have a sub account yet, you will must to create one by accessing your portal.)

Click on Trunk tab in your Call2Teams Admin Portal, and "Add a new trunk".

With the drop-down, you will need to choose "[Custom]" then accept the warning by clicking on "[Proceed with Unsupported Configuration]"

Call2Teams Services Trunk Create.png

Now, you will need to specify your sub account credentials and validate some informations.

Call2Teams Services Trunk Create Voipms P1.png
  • Service Name: Trunk 1 (Per instance, it may be different)
  • Country: Your Country
  • State/Province: Your State
  • Range Start/Range End: This will be your DID(s), However you will need to add the sign + followed by the (country code) of the DID, then your DID.
If you have more than one DID that you would like to add and they are not sequential, you will simply need to add the DID on the field START Range and the Range END.
You will need to add each DID separately by adding a new range by clicking on [+ Add Additional Range]

Call2Teams Services Trunk Create Voipms P2.png
  • SIP Domain: You will need to indicate the PoP Server that you would like to use with your Trunk. Be sure that your DID are on the same PoP Server, in order to receive incoming calls.
  • SIP Proxy: - You must leave this option blank -
  • Authenticate Type: Select Registration
  • Username: You will need to indicate your Sub Account Username. (######_Username)
  • Auth Username: You will need to indicate your Sub Account Username. (######_Username)
  • Password: The password or your Sub Account.

Call2Teams Services Trunk Create Voipms P3.png
  • Expiry (seconds): You may click on the Padlock, and enter the value [300], or you may also leave this option by default.
  • Protocol: We suggest using UDP but you can use TCP.
  • Encrypt Media: Set the option to No
  • Propagate Refer: [Yes] NOTE: Select 'Yes' to propagate received SIP REFER messages from Microsoft upstream to this service.
If set to 'No' then transfers are bridged out as new calls. On the 2nd Gen OneClick Teams connector you should select 'Yes' if you have users in a Call Center, but otherwise select 'No' as this will allow consultative transfers to work better.
  • Propagate Refer: Select [No]
  • Outside Line Prefix: - You must leave this option blank -
  • E164 Number Format: Select [Localized]

  • From Header: You must select [SIP Identifier]
  • P-Asserted-Identity Header: This will be the outbound caller ID Name that will appear to the caller when you call to a Canadian number.
Note: For any outbound calls to an American number, most of these providers will use the data contained in the CNAM/LIBD Database associated with your outbound caller ID number (DID) to displaying your caller ID Name to your caller.
You can request an update of the CNAM/LIBD Database by submitting a request on the Live Chat or through a ticket.
We suggest choosing one of these only, Generaly it will be [Passthrough Caller Id]
  • [Passthrough Caller Id] This will be the caller ID given by the far end (e.g. Teams (The user extension name)),
  • [Trunk User Number]: To display the phone number assigned to the user in the portal

  • E164 Number Translation (The incoming number needs to be converted to E164 format)
    • Outbound International Prefix: Indicate 011
    • Outbound National Prefix: - You can leave as blank -
    • Inbound International Prefix: Indicate
    • Inbound National Prefix: - You can leave as blank -

Once the configuration is complete, you will need to press the [Add] button.

To validate if your Trunk that you've created is successfully registered in your sub-account, you will see a Green light appear in the left corner of your Trunk entry. When you put your mouse on the green light, you will then see the next recording.

Call2Teams Service Trunk Registered.png

Associate a Number to Your Microsoft Teams Members

When your trunk is created, you will need to associate a number (DID) to your Microsoft Teams members. To do so, Go to the Users tab, from the upper navigation bar.

Call2Teams NAV Users.png

Click on the button, Add User, You will need to choose one of your Microsoft Teams members that you would like to associate a number. Then, select your trunk and the wished number you want to assign.

Call2Teams Users AddUser.png

After adding your numbers to your members, you will need to click on the upper right button [Sync Now].

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