Last updated: Jul 2, 2026, 6:39 PM by ggarcia@calltower.com

Overview

CallTower offers an eSIM product for both Microsoft (Teams Mobile) and Cisco (Webex Go). These products allow users to make and receive calls via their Teams/Webex phone numbers through the native calling experience on their mobile devices (without the need of any apps).

CallTower also offers a unique product differentiator that can integrate SMS Messages (via CT Text) with the eSIM offering. This would additionally allow users to send and receive SMS messages with their Teams/Webex phone numbers through the native messaging experience on their phone (also removing the requirement of additional branded apps (such as Teams or Webex apps).

This integration with CallTower's eSIM service means that users will be able to:

1. Receive inbound messages in both the Tango eSIM and the YakChat service using the same number

2. Send outbound messages from both the Tango eSIM or the YakChat service using the same number

3. Move to their YakChat app for more advanced text features and the texts sent from the mobile will be available on the desktop

How to Enable the eSIM integration with CT Text 

In the CT Text Admin Portal

Integrations settings

1. Login to the CT Text Admin Portal

2. In the Integrations menu, select the Tango Networks eSIM tile and click the Add + button

3. In the window that appears, the following Integration details will be automatically generated:    

   1. URL, e.g. https://api.yakchat.com/tango/message

   2. Client Secret, e.g. 599dbf7cbe764597b5cdf724d64de38f

   3. Security Token, e.g. a50eaa6e64cf4ffe93237a5ccf20e011

4. You can easily copy the data above to the clipboard using the Copy icon

   Note:

   You would need these values later to complete the integration setup in the Tango Networks Control Panel

5. Close the Integration tile

Inbox settings

1. Login to the CT Text Admin Portal

2. In the Inbox menu, create a new or edit an existing Inbox

3. In the SMS number field enter the business phone number that was added to the Tango eSIM

4. Turn the Tango eSIM integration toggle On

5. Optionally, if you would like to forward the outbound messages sent from the messaging app to the eSIM, turn the Send outbound to eSIM toggle On.

6. Save your changes

In Tango Networks Control Panel 

1. Login to your Tango Network Control Panel account

2. Create a new or edit an existing Messaging Gateway

3. Enter the Integrations details values that you copied earlier from the YakChat Admin Portal in their respective fields:

   1. URL, e.g. https://api.yakchat.com/tango/message

   2. Client Secret, e.g. 599dbf7cbe764597b5cdf724d64de38f

   3. Security Token, e.g. a50eaa6e64cf4ffe93237a5ccf20e011

   4. Save your changes 

4. Under the Tango User profile, edit the user and select the Messaging Gateway that was recently created.