Replace <your_api_key> and <your_api_token> with the API key and token created by you.
Replace <your_sid> with your “Account sid”
Replace <subdomain> with the region of your account
<subdomain> of Singapore cluster is @api.exotel.com
<subdomain> of Mumbai cluster is @api.in.exotel.com
<your_api_key> , <your_api_token> and <your_sid> are available in the API settings page of your Exotel Dashboard