Description: The Different DPNSS DPNSS trunk States as specified by BTNR 188. Also incorporates maintenance operation states that. icSetupReq - Incoming Setup Request Indicates that there is an incoming setup request (ISRM receipt). ogSetupReq - Outgoing Setup Request Indicates that there is an outgoing setup request outgoing ISRM). icSetupComp - Incoming Setup Complete Indicates that the trunk in inSetupReq state has sent a successful Ack (sending of DPNSS Number Acknowledge (NAM) message). ogSetupComp - Outgoing Setup Complete Indicates that the trunk in ogSetupReq state has received a successful acknowledgement(incoming NAM). inSetupCompBuf - Incoming Setup Complete Buffer Indicates the receipt of a message received on a trunk in inSetupComp state and being buffered (example, the received EEM(I)s may be buffered till the receipt of EEM(C)s before being processed. ogSetupCompBuf - Outgoing Setup Complete Buffer Indicates the receipt of a message received on a trunk in ogSetupComp state. inAns - Incoming Answer Indicates the sending of an of an answer message (incoming DPNSS Call Connected Message (CCM)). ogAns - Outgoing Answer Indicates the receipt of an answer message on a trunk that is in ogSetupComp state(outgoing CCM). Clearing Indicates the sending of an clearing message (outgoing DPNSS Clear Request Message (CRM). The trunk will return to idle state or the receipt of a DPNSS Clear Indication Message from the peer PBX in response to the CRM. idle Default working state when no call attempt or call in progress on this trunk. bsy - busy Indicates a maintenance operation status of the trunk -- Mukundan/Naganathan/Mangalpally/Anantharaman 27 -- Internet Draft draft-ranjith-dpnss-mib-00.txt November 2000 during which this trunk will not be used for call processing. Generally done to perform some maintenance on the DPNSS trunk. LockOut Indicates that the corresponding Layer 2 DLC is Out Of- Service. inB - installation Busy Indicates a maintenance operation of the trunk during which, apart from this trunk not being available for call processing, the configuration parameters (like dpnssTrkDir etc) of the trunk can be changed. The implementor may chose to just use the bsy state as a superset state instead of inB in which case this state will be rendered redundant. offLine - Indicates a maintenance operation of the trunk during which, apart from this trunk not being available for call processing, the trunk interface configuration parameters also cannot be changed. This state is used normally to completely delete this interface and reconfigure as some other interface. The vendor may just chose to just use the inB state as a superset state instead of offline in which case this state will be rendered redundant. Further, the DS1 interface over which the DPNSS trunks and signaling channel is configured cannot be shared across another protocol (e.g. ISDN - Primary Rate Interface) interface - this further reduces the usefulness of this state but the parameter is provided in favour of implementation flexibility.