CISCO-XGCP-MIB
This MIB is an enhancement for existing XGCP-MIB. xGCP is a set of protocols, for example SGCP (Simple Gateway Control Protocol) and MGCP (Media Gateway Control Protocol), which are designed as a control protocol within a distributed system that appears to the outside as a single VoIP/VoATM gateway. This system is composed of a call agent (or MGC, Media Gateway Controller) and of a set of 'media gateways' that perform the conversion of media signals between circuits and packets. In the xGCP model, the gateways focus on the audio signal translation function, while the call agent handles the signaling and call processing functions. Examples of Gateway Control Protocols are: * Simple Gateway Control Protocol (SGCP) * Media Gateway Control Protocol (MGCP) xGCP assumes a connection model where the basic constructs are: Endpoints : sources or sinks of data that could be physical or virtual. Connections : an association between two or more endpoints with the purpose of transmitting data between these endpoints. Once this association is established for both endpoints, data transfer between these endpoints can take place. Connections are grouped in calls. One or more connections can belong to one call. Connections and calls are set up at the initiative of one or several call agents. Terminologies used: AAL : ATM Adaptation Layer AUCX : Audit Connection Command used by the MGC to find out the status of a given gateway connection. AUEP : Audit Endpoint Command used by the MGC to find out the status of a given endpoint. CCAPI : Call Control Application Program Interface. CID : Channel Identifier CRCX : Connection Command from a MGC to request the gateway MG : Media Gateway MGC : Media Gateway Controller DLCX : Delete Command. This command can be initiated by either the MGC or gateway. GSM : Global System for Mobile Communications GW : Gateway. HP : Hairpin MDCX : Modify Connection Command from a MGC to request the gateway NSE : Negative Stuffing Event NTFY : A Notify Command sent from a gateway to a MGC in response to a RQNT command. PSTN : Public Switched Telephone Network RQNT : Request To Nofity Command from a MGC to request the gateway to provide a notification for configuration changes. RSIP : Restart in Progress Command. This command can be initiated by either the MGC or gateway. SPRT : Simple Packet Relay Transport SSE : Silicon Switching Engine TDM : Time Division Multiplexing TGW : Target Gateway TWC : Three Way Calling VCCI : Virtual Circuit Connection Identifier VMG : Virtual Media Gateway. It is a logical representation of a module (or a set of modules) that has MG functionality. There could be multiple VMGs in a device. VoAAL2 : Voice over AAL2