Use Notify with on-call scheduling Within on-call scheduling, you can use Notify functions to send an SMS to on-call resources when an incident gets assigned to them. A mobile number is required in their user record. Be aware that some phone numbers have only voice mail capabilities. Notify is available as a separate subscription from the ServiceNow platform. To purchase a subscription, contact your ServiceNow account manager. Notify workflow for on-call schedulingThe On-Call: Assign by Acknowledgement workflow is provided with Notify. The workflow uses data from the escalation settings of rotas and rosters. Depending on these settings, the workflow iterates through the defined escalation chain and sends notifications by SMS or email to users about incident assignment.