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CAMEL/INAP Call Configuration

CAMEL/INAP Configuration

When using the SCP protocol handler for CAMEL/INAP calls, additional global action rule definitions may be specified:

General SCP parameters
Announcement definitions
FCI and/or SCI configuration
Tone rules

Selector Rules Extensions

In addition to the standard N2SVCD selector rule attributes and the N2IWF selector rule extensions, the SCP protocol handler provides additional elements.

Available Actions

The following actions are available for global action rule definitions when using CAMEL/INAP calls.

Action	Required Parameters	Optional Parameters	Valid At	Applies To	Description
`continue`	-	-	(all)	(all except Error Handling)	Continue the call normally with rating interaction where applicable.
`release`	-	`cause`	(all)	(all)	Release the call immediately with the given `cause`. May be specified as `edp` in order to pass through the received EDP cause from the network, if any.
`free`	-	-	Initial	(all except Error Handling)	Allow the call to continue unmonitored on the network with no further rating interaction.
`grace`	`seconds`		Initial Update	(all except Post-Rating)	Allow the call to continue monitored on the network for a limited time with no further rating interaction.
`divert`	`divert_to`	-	Initial	(all))	Terminate the call to the provided `divert_to` with no further rating interaction.
`abort`	-	-	(all)	(all)	Send a `TC_ABORT` to end the call immediately.

SCP Action Rule Directives

When processing action rules, in addition to the core N2IWF action rule directives, SCP-specific directives may also be used to apply N2IWF SCP features.

Directive	Type	Description
`announcement`	String	Causes an announcement to be sent.
`fci`	String	Causes an FCI to be sent.
`sci`	String	Causes an SCI to be sent.

Note that these directives are ignored in non-action rules used for source selection, e.g. requested time rules.

Additional Selectors

In addition to the standard N2SVCD rule engine selector rule fields, and the N2IWF additional selectors, SCP-specific selectors may also be used.

Selector	Type	Description
`input.originating`	Boolean	Whether the call is an originating leg.
`input.forwarding`	Boolean	Whether the call is a forwarded leg.
`input.terminating`	Boolean	Whether the call is a terminating leg.
`input.ssp_inap`	String	The SSP INAP variant of the initiating SSP, as per the N2SCP INAP models. Note that the special value `camel` may be used to refer to any CAMEL variant.
`input.bearerCap_itc`	Integer	The Initial DP → Bearer Capability → Information Transfer Capability value.
`input.locationInformation_mcc`	Integer	The Mobile Country Code contained within the Initial DP → Location Information sequence. Note that the exact parameter that this is taken from within Location Information may differ depending on the SSP INAP variant.
`input.locationInformation_mnc`	Integer	The Mobile Network Code contained within the Initial DP → Location Information sequence. Note that the exact parameter that this is taken from within Location Information may differ depending on the SSP INAP variant.
`input.locationInformation_lac`	Integer	The Location Area Code contained within the Initial DP → Location Information sequence. Note that the exact parameter that this is taken from within Location Information may differ depending on the SSP INAP variant.
`input.locationInformation_ci`	Integer	The Cell ID contained within the Initial DP → Location Information sequence. Note that the exact parameter that this is taken from within Location Information may differ depending on the SSP INAP variant.
`service.edp`	String	Whether this rule applies only when a specific EDP has been received. If defined, must be a valid EDP name.
`service.edp_cause`	Integer	Whether this rule applies only when a specific EDP cause has been received from the network.

In addition, all fields in the SCP-HANDLE-ALEG-IDP message may be used as selectors or source values. The initialdp_arg field will be populated as per the relevant INAP ASN.1 for the INAP variant in use.

These selectors are available for all rules, including action rules.

Note that the input. prefix is included here for clarity, but is not required as it is the default N2SVCD rule engine namespace.

EDP Names

Valid EDP names for use in SCP selector rules are:

busy: matches the EDPs oCalledPartyBusy or tBusy
rsf: matches the EDP routeSelectFailure
no_answer: matches the EDPs oNoAnswer or tNoAnswer
abandon: matches the EDPs oAbandon or tAbandon

Note that EDPs are only received at the conclusion of a call, so will only apply in practice during post-rating.

Subscriber Information Selection

When an Initial DP message is received for processing, subscriber details are extracted as:

IMSI: taken from the IMSI digits, if present.
MSISDN: differs depending on the call direction.
- Originating calls: taken from the calling party.
- Terminating calls: taken from the called party.
- Forwarding calls: taken from the redirecting party.

The specific protocol field that these values are drawn from will depend on the relevant INAP ASN.1 for the INAP variant in use.