Abstract: A communication device sends a Session Initiation Protocol (SIP) INVITE message to establish a call. In response, the call is forked. For example, in parallel forking, the SIP INVITE may be sent to two different communication devices. The forking causes each communication device to send at least one provisional response message. In this case, first and second SIP provisional response messages are received that include Session Description Protocol (SDP) information for a media stream. A first media stream associated with one of the first or second SIP provisional response messages is received and played. A second media stream associated with the other one of the first or second SIP provisional response messages is received within a first time period. In response to receiving the second media stream within the first time period, the first media stream is discarded and the second media stream is played.

Abstract: The concept of a secure call indicator is introduced. In general, the secure call indicator is capable of inspecting the security of signaling associated with Session Initiation Protocol (SIP) messages and comparing the security with media descriptions of the actual media path of the SIP messages. Furthermore, the secure call indicator may be configured to indicate the security associated with a communication session via a physical or virtual notification system.

Abstract: The system and method detect and properly handle a glare condition in a SIP communication session. A glare condition is where a communication device has two concurrent outstanding requests (typically an incoming and an outgoing request that have not be acknowledged) and needs to process one of the requests before processing the other request. To detect a glare condition, the system and method identify that an out-of-dialog SIP request is received while an outgoing SIP request is pending. In response to detecting the glare condition, a glare algorithm is initiated. The glare algorithm ensures that outstanding requests will be handled in a timely manner.

Abstract: The concept of a secure call indicator is introduced. In general, the secure call indicator is capable of inspecting the security of signaling associated with Session Initiation Protocol (SIP) messages and comparing the security with media descriptions of the actual media path of the SIP messages. Furthermore, the secure call indicator may be configured to indicate the security associated with a communication session via a physical or virtual notification system.