CreateConnection (CRCX) Response in .NET

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CreateConnection (CRCX) Response
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ReturnCode TransactionId Commentary ConnectionId [SpecificEndpointId] [LocalConnectionDescriptor] [SecondEndpointId] [SecondConnectionId] [PackageList]
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ModifyConnection (MDCX) Command
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MDCX TransactionId EndpointId MGCP 10 CallId ConnectionId [NotifiedEntity] [LocalConnectionOptions} [Mode] [RemoteConnectionDescriptor] [encapsulated NotificationRequest] [encapsulated EndpointConfiguration]
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ModifyConnection (MDCX) Response
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ReturnCode TransactionId Commentary [LocalConnectionDescriptor] [PackageList]
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DeleteConnection (DLCX) Command (from Call agent to Gateway)
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DLCX TransactionId EndpointId MGCP 10 CallId [ConnectionId]* [encapsulated NotificationRequest] [encapsulated EndpointConfiguration]
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* A call agent might want to delete all connections for a given endpoint and a given call, rather than just a single connection In such a case, the DLCX command from the call agent would not include the ConnectionId parameter
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Media Gateway Control and the Softswitch Architecture
Media Gateway Control and the Softswitch Architecture
DeleteConnection (DLCX) Response (from Gateway to Call agent)
ReturnCode TransactionId Commentary ConnectionParameters [PackageList]
DeleteConnection (DLCX) Command (from Gateway to Call Agent)
DLCX TransactionId EndpointId MGCP 10 CallId ConnectionId ReasonCode Connectionparameters
DeleteConnection (DLCX) Response (from Call Agent to Gateway)
ReturnCode TransactionId Commentary [PackageList]
AuditEndpoint (AUEP) Command
AUEP TransactionId EndpointId MGCP 10 [RequestedInfo]
AuditEndpoint (AUEP) Response
ReturnCode TransactionId Commentary EndpointIdList | { [RequestedEvents] [QuarantineHandling] [DigitMap] [SignalRequests] [RequestIdentifier] [NotifiedEntity] [ConnectionIdentifiers] [DetectEvents] [ObservedEvents] [EventStates] [BearerInformation] [RestartMethod] [RestartDelay] [ReasonCode] [MaxMGCPDatagram] [Capabilities] [PackageList]
AuditConnection (AUCX) Command
AUCX TransactionId EndpointId MGCP 10 ConnectionId RequestedInfo
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Media Gateway Control and the Softswitch Architecture
AuditConnection (AUCX) Response
ReturnCode TransactionId Commentary [CallId] [NotifiedEntity] [LocalConnectionOptions] [Mode] [RemoteConnectionDescriptor] [LocalConnectionDescriptor] [ConnectionParameters] [PackageList]
6
RestartInProgress (RSIP) Command
RSIP TransactionId EndpointId MGCP 10 RestartMethod [RestartDelay] [ReasonCode]
RestartInProgress (RSIP) Response
ReturnCode TransactionId Commentary [NotifiedEntity] [PackageList]
Call Setup Using MGCP
Utilizing the foregoing descriptions of commands and responses, it is possible to describe MGCP-based call setup in some detail The following description of the process assumes that two endpoints are to be used on two different gateways, but that both gateways are connected to the same call agent Call setup using MGCP involves the creation of at least two connections, as shown in Figure 6-7 First, a call agent uses the CRCX command to instruct a gateway to create a connection on an endpoint The call agent may specifically identify the endpoint to be used or may use a wildcard notation to enable the gateway to choose the endpoint The gateway creates the connection and responds to the call agent with a session description (LocalConnectionDescriptor) applicable to the connection The LocalConnectionDescriptor is an SDP description of the session as it applies to the connection just created Therefore, it contains information such as an IP address, port number, and media coding Upon receipt of the response from the first gateway, the call agent instructs the second gateway to create a connection on an endpoint The call agent has more information available for inclusion in the CRCX command
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Media Gateway Control and the Softswitch Architecture
Media Gateway Control and the Softswitch Architecture
Call Agent
Media Gateway
Figure 6-7 MGCP call establishment overview
Media Gateway
a Create Connection b c Create Connection Session description 1 (remote) d e Response Session description 2 (local) Modify Connection Session description 2 (remote) f Media Transfer Response Session description 1 (local)
to the second gateway than it had for the CRCX command for the first gateway Specifically, the call agent is armed with knowledge of the session description applicable to the connection on the first endpoint, and it can pass this information to the second endpoint Therefore, the call agent issues a CRCX command to the second gateway and includes the optional RemoteConnectionDescriptor parameter, which contains the session description obtained for the connection made on the first endpoint Thus, the second endpoint in the call now has a session description related to the first endpoint and knows where to send media For the moment, the first endpoint in the call is still in the dark The second endpoint sends a response to the CRCX command and includes the LocalConnectionDescriptor parameter, which is a session description related to the connection created on the second endpoint Third, the call agent issues an MDCX command to the first gateway The command contains a RemoteConnectionDescriptor parameter, corresponding to the session description received from the second gateway for the second endpoint At this stage, both endpoints now hold a session description for the other and know exactly where to send the media stream and in what format Media can now be exchanged Figure 6-8 shows a detailed example of call establishment between two gateways, with each supporting DS0 endpoints and managed by the same call agent, including the session descriptions involved
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