How to open SMS receipt for Unicom number

Unicom has no short message receipt service for the time being, only a call manager, which is a communication assistant service to remind and manage missed short messages. The user's mobile phone is turned off, and there is no electricity. Incoming calls will be transferred to the voice platform of the call manager, and the call manager system will answer the user's phone and send short messages. Remind users of missed calls. Including missed message reminder, missed message reminder with short message, number change notice and status background? Settings and other functions.