Methods and apparatus are disclosed to provide protection against Unsolicited Communication (UC) in a network, such as, without limitation, an Internet Protocol (IP) Multimedia Subsystem (IMS). A communication may originate from a sending device and may be intended for delivery to a receiving device. A network may determine authentication information associated with the sending device. The network may send the authentication information to a receiving entity to evaluate if the communication is unsolicited using the authentication information. If the communication is determined to be acceptable, a connection associated with the communication may be allowed.