Oullim Contact Center app is a sign language relay service app for the hearing impaired.You can easily register and use with your own number, and you can receive a relay service through a sign language interpreter.-It is possible to communicate in various environments by connecting to a sign language interpretation service center and providing interpretation services through information received through wireless terminals.main function -Video call with a sign language interpreter using your own phone number-Call center interpretation service provided-High-definition video call service support