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Channel type not implemented The typical scenario is channel type match is not found. 66 Indicates that the equipment that sent this cause does not support the channel type requested. The requested facility is not implemented The typical scenario is service type match is not found. 69 Indicates that the equipment that sent this cause does not support the requested supplementary service. Only restricted digital information bearer capability is available (national use) The typical scenario is a routing error. 70 Indicates that the calling party has requested an unrestricted bearer service but that the equipment that sent this cause only supports the restricted version of the requested bearer capacity. Service or option not implemented, unspecified The typical scenario is a service is not implemented. 79 Reports a service or option not implemented event only when no other cause in the service or option not implemented class applies. Invalid call reference value The typical scenario is the far-end switch did not recognize the call reference for a message sent by the gateway. 81 Indicates that the equipment that sent the cause has received a message with a call reference that is not currently in use on the user-network interface. The identified channel does not exist The typical scenario is a fractional PRI error. 82 Indicates a call was attempted on a channel that is not configured. A suspended call exists, but this call identity does not The typical scenario is a call ID mismatch. 83 Indicates a call resume has been attempted with a call identity that differs from that in use for any presently suspended calls. Call identity in use The typical scenario is equipment error. 84 Indicates that the network has received a call suspended request that contains a call identity that is already in use for a suspended call. No call suspended The typical scenario is equipment error. Indicates that the network has received a call resume request that contains a call identity information element that does not indicate any suspended call. The call that has Typical scenarios Indicates that the network has received a call identity 86