/mcpinformation discarded is usually reported when the far-end ISDN switch removes some piece of information before tandem- switching a call. information to the called party as requested. The requested circuit/channel is not available The typical scenario occurs during glare conditions when both sides are selected top-down or bottom-up. Change the Allocation Direction so that one end is top-down and the other is bottom- up. 44 Returned when the circuit or channel indicated by the requested entity cannot be provided by the other side of the interface. Precedence call blocked The typical scenario is a caller that is busy and the priority level of active call is equal to or higher than the incoming call. 46 Indicates that there are no preemptive circuits or that the called party is busy with a call of equal or higher preemptable level. Internal resource allocation failure Typical scenarios include: Out of memory • Internal access to the TCP socket is unavailable • 47 CC_CAUSE_NO_RESOURCE Indicates a resource unavailable event. QoS Error The typical scenario is a Quality of Service (QoS) error. 49 CC_CAUSE_QOS_UNAVAILABLE Indicates that the requested QoS cannot be provided. The requested facility is not subscribed The typical scenario is the caller tries to use a service that is not permitted. 50 Indicates that the party has requested a supplementary service that it is not authorized to use.