How can I add Tata Teleservices as a gateway in Vtiger CRM?

Follow these steps to set up Tata Teleservices as a normal gateway in Vtiger CRM:

1. Log in to the CRM. 
2. Click on the User Menu on the top right corner of the screen. 
3. Click Settings. 
4. Look for the Extensions section.
5. Select Phone Configuration. The Phone Configuration page opens.
6. Click +Add Gateway. The Gateway Configuration page opens.
7. Enter or select the following information -
   1. Gateway: Select Tata Tele Business Services from the Gateway drop-down.
   2. Gateway Status: Select Active from the Gateway Status drop-down. This activates the gateway for incoming and outgoing calls.
   3. Default Gateway: Set the gateway as default by selecting Yes from the Default Gateway drop-down. 
   4. Label: Enter a keyword to label the gateway in the Label field.
8. Click Save.