Abstract: A method for accessing a CCBS service based on an identity comprises: when receiving a call invite and determining that the call invite includes a call completion indicator, a Terminating Application Server (T_AS) authenticates the identity of a caller initiating the call invite, allows the access of the caller when the identity authentication is passed; and rejects the access of the caller when the identity authentication is failed.

Abstract: A method for accessing a CCBS service based on an identity comprises: when receiving a call invite and determining that the call invite includes a call completion indicator, a Terminating Application Server (T_AS) authenticates the identity of a caller initiating the call invite, allows the access of the caller when the identity authentication is passed; and rejects the access of the caller when the identity authentication is failed.

Abstract: A method for filtering a malicious call completion indicator in a CCBS service is provided, in which a calling-side network device rejects the current call request or removes the call completion indicator information from the call request and then forwards the call request, when determining the call request carries the information. The disclosure also provides a corresponding apparatus, which includes a reception unit configured to receive a call request, a detection unit configured to detect the call request and to trigger the rejection unit when determining that the call request carries call completion indicator information and a rejection unit configured to reject the current call request. A calling-side network device is also provided. According to the disclosure, the sequence for accessing the calls from calling subscribers to a called subscriber is well kept, thus assuring fairness of the call access and avoiding preferential call access of malicious subscribers.