Sending an SMS on behalf of a call queue is not currently supported by Workflow Builder. If you need to send SMS messages from a call queue's direct number (or "DL"), you must create the call queue without having a call queue manager. The call queue must be set with unique email address and password and to send SMS from that call queue number, the app must be authenticated using the call queue's login credentials.
Alternative solution
The challenge in sending SMS from a call queue's phone number rests in the fact that you cannot send SMS from an extension that is not of type "User." In other words, only human beings can send SMS from phone numbers that are assigned to them. Knowing this, the solution should become relatively intuitive.
- First, you will need to reconfigure the call queue extension and re-assign the phone number to a User extension.
- Next, login to the RingCentral App as the user who you assigned the phone number to. Navigate to Settings > Phone > Call rules and voicemail.
- Click "Add Rule" then "Create Custom Rule." Give the rule a name.
- Under "Calling me at" select the call queue's phone number. Click Next.
- Click "Choose routing option" and select "Forward the call." Then forward the call to the call queue.
Once you have configured your call queue to receive calls in this way, then people who call the designated phone numbers will be routed to the queue. But now, any SMS sent to that phone number can be setup in Workflow Builder to both send and receive SMS.