A.6 EstablishTemporaryConnection operation

29.0783GPPCAMEL Application Part (CAP) specificationCustomised Applications for Mobile network Enhanced Logic (CAMEL) Phase XRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

On receipt of an EstablishTemporaryConnection operation from the gsmSCF then if the triggering of the CAMEL service was made for a mobile terminating call in the GMSC or VMSC or for a forwarded call, then an ISUP ACM shall be sent to the preceding exchange. The encoding of the backward call indicators in the ISUP ACM is specified in 3GPP TS 09.12 [1]. In addition, an ISUP IAM shall be sent to the succeeding exchange.

Table A.5 illustrates the mapping of parameters received in the EstablishTemporaryConnection operation to parameters sent in the ISUP IAM to the succeeding exchange. On sending of the ISUP IAM the awaiting address complete timer is started. If the timer expires, then the call is released in both directions and an appropriate indication is returned to the calling subscriber.

Table A.5

CAP Operation EstablishTemporaryConnection	ISUP message IAM
AssistingSSPIPRoutingAddress (note 1)	Called party number
CorrelationID	Correlation id (note 2)
ScfId	GsmSCF id (note 2)
OriginalCalledPartyID	Original called number (note 3)
CallingPartyNumber	Calling party number (note 3)

NOTE 1: The AssistingSSPIPRoutingAddress parameter may also include a Hex B digit, in order to delineate the boundary between digits used for routeing and digits forming part of the SCFiD and/or CorrelationID.

NOTE 2: These optional parameters may be absent, i.e. they are mapped only if received. If they are received and cannot be mapped, then an error is sent to the gsmSCF as detailed in clause 11.

NOTE 3: These optional parameters may be absent, i.e. they are mapped only if received.

Except for the Called Party Number the remaining mandatory ISUP IAM parameters are set as follows:

a) Nature of connection indicators

Satellite indicator: set as in an Originating MSC,

Continuity check indicator: set as in Originating MSC,

Echo control device indicator: set as in Originating MSC

b) Forward Call Indicators

National/international call indicator: set as in Originating MSC,

End-to-end method indicator: 00 (no end-to-end method available),

Interworking indicator: 0 (no interworking encountered),

End-to-end information indicator: 0 (no end-to-end information available),

ISDN User Part indicator: 1 (ISDN User Part used all the way),

ISDN User Part preference indicator: 00 (ISDN User Part preferred all the way),

ISDN access indicator: 0 (originating access non-ISDN),

SCCP method indicator: 00 (no indication)

c) Calling Party’s Category

00001010 (ordinary subscriber)

d) Transmission Medium Requirement

00000011 (3.1 kHz audio)

The ISUP IAM optional parameter Propagation Delay Counter is set as in an Originating MSC.