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DIAMETER-S Messages

Introduction

The DiameterApp uses DIAMETER-S-… messages to communicate with other applications (such as the LogicApp) to handle inbound Diameter requests received from an external Diameter Client.

The following LuaApp services from the core n2svcd module handle messages from DiameterApp.

DiameterLuaService (handles inbound Diameter requests within LogicApp)

The internal DIAMETER-S-… messages are:

DIAMETER-S-REQUEST
DIAMETER-S-RESPONSE

Note that this page uses the term “on-the-wire” to refer to the sending or receiving of Diameter content by the DiameterApp. This term is also inclusive of the case where the message is sent by local loopback and does not physically transit a Network Interface Controller (NIC).

DIAMETER-S-REQUEST

The DIAMETER-S-REQUEST message is sent by DiameterApp to the application that is configured for handling of inbound Diameter requests.

Refer to the DiameterApp Configuration documentation for more information on setting default parameters.

The attributes of the DIAMETER-S-REQUEST message are:

Attribute	Type	Description
`diameter`	Object	Container for the parameters of the Diameter request that we have received.
`.bytes`	Object	[Required] The raw on-the-wire Diameter request bytes.
`.connection`	String	Container for connection information.
`.remote_ip`	String	The remote dot-notation IP address from which the Diameter request was received.
`.remote_port`	Integer	The remote TCP or UDP port from which the Diameter request was received.
`.name`	String	The name of the Diameter command, e.g. `Credit-Control` if known.
`.code`	Integer	[Required] The numeric code for the command.
`.application_id`	Integer	The received Application-ID from the request header.
`.avps`	Array of Object	[Required] Array of AVP descriptors each with the following fields.
`[].name`	String	The name of the Diameter AVP, e.g. `Rating-Group`, if known.
`[].code`	Integer	[Required] The code of the Diameter AVP.
`[].vendor_id`	Integer	The vendor ID, if present.
`[].type`	String	[Required] One of `None`, `OctetString`, `UTF8String`, `DiamIdent`, `Integer32`, `Integer64`, `Unsigned32`, `Enumerated`, `Time`, `Unsigned64`, `Address`, `Grouped`.
`[].mandatory`	`0`/`1`	Is the AVP specified as mandatory?
`[].encryption`	`0`/`1`	Is the AVP specified as encrypted?
`[].value`	Various	The value for this AVP. For AVPs of type `Grouped` this will be an ARRAY. For all other AVPs this is a SCALAR of the appropriate type.

DIAMETER-S-RESPONSE

The DIAMETER-S-RESPONSE message is sent back to the DiameterApp by the handling application when it is ready to send a Diameter Response to the original received Diameter Request.

The attributes of the DIAMETER-S-RESPONSE message are:

Field	Type	Description
`success`	`0`/`1`	[Required] Indicates if the request handling was successful or not.
`error`	String	Indicates the reason why the request handling failed. Present and applicable only if `success` == `0`.
`diameter`	Object	Container for the Diameter response parameters we are to send. Present only if `success` == `1`.
`.avps`	Array of Object	Array of AVP descriptors each with the fields described as for a request.
`[].name`	String	The name of the Diameter AVP, e.g. `Rating-Group`. This must be a supported AVP name within `N2::DIAMETER::Codec` or `DiameterApp` custom AVPs. If your AVP name is not supported, you may instead specify `[].code`.
`[].code`	Integer	The code of the Diameter AVP, if not specifying by `[].name`.
`[].vendor_id`	Integer	The vendor ID. This field is optional and can be specified both when selecting the AVP by `[].name` (to distinguish between scenarios where the same name is used by different vendors) or when selecting the AVP by `[].code` in order to specify the intended vendor ID.
`[].type`	String	One of `None`, `OctetString`, `UTF8String`, `DiamIdent`, `Integer32`, `Integer64`, `Unsigned32`, `Enumerated`, `Time`, `Unsigned64`, `Address`, `Grouped`. This is used only when specifying an AVP by `[].code`. For named AVPs the type is pre-defined.
`[].mandatory`	`0`/`1`	Override the default mandatory AVP flag. This is used only when specifying an AVP by `[].code`. For named AVPs the mandatory flag is pre-defined.
`[].encryption`	`0`/`1`	Override the default encryption AVP flag. This is used only when specifying an AVP by `[].code`. For named AVPs the encryption flag is pre-defined.
`[].value`	Various	The value for this AVP. For AVPs of type `Grouped` this will be an ARRAY. For all other AVPs this is a SCALAR of the appropriate type.

The other attributes of the Diameter response are automatically determined by the DiameterApp.