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Content for  TS 23.172  Word version:  18.0.0

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4.3.3 Terminating side  4.3.3.1 HLR Interrogation  4.3.3.1.1 Send Routing Info  4.3.3.1.2 Send Routing Info Ack 
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4.3.3  Terminating side  p. 24

4.3.3.1  HLR Interrogation  p. 24

The GMSC sends the Send Routing Information request with both the Network Signal Information and Network Signal Information 2 parameters. The Network Signal Information shall include the ISDN BC IE for the preferred service, and the Network Signal Information 2 includes the ISDN BC IE for the less preferred service.
The functional behaviour of the HLR is described in TS 23.018. The procedures specific to SCUDIF calls are specified in the subclause 4.3.3.1.3 for the HLR and 4.3.3.1.4 for the GMSC. The information elements specific to SCUDIF between the GMSC and the HLR are specified in subclauses 4.3.3.1.1 and 4.3.3.1.2.
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4.3.3.1.1  Send Routing Info  p. 25
The following element specific to SCUDIF calls is defined for Send Routing Info:
Information element name Status Description
ISDN BC 2CISDN bearer capability 2. Shall be present for a SCUDIF call to indicate the less preferred service.
ISDN LLC 2CISDN lower layer compatibility 2. Shall be present for a SCUDIF call if necessary for the less preferred service, otherwise shall be absent.
ISDN HLC 2CISDN higher layer compatibility 2. Shall be present for a SCUDIF call if necessary for the less preferred service, otherwise shall be absent.
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4.3.3.1.2  Send Routing Info Ack  p. 25
The following elements specific to SCUDIF calls are defined for Send Routing Info Ack:
Information element name Status Description
Roaming number 2CE.164 number required to route the call to VMSCB (see TS 23.003) for the less preferred service of a SCUDIF call. Shall be present for a SCUDIF call if the preferred service is not forwarded (i.e. either Roaming Number is present or the preferred service is not allowed) and the less preferred service is allowed and not forwarded, otherwise shall be absent.
Forwarded-to number 2CE.164 number of the C subscriber for the less preferred service of a SCUDIF call. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is to be forwarded, otherwise shall be absent.
Long forwarded-to number 2CNumber of the C subscriber (see TS 23.082) for the less preferred service of a SCUDIF call. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is to be forwarded, and GMSC and HLR support Long Forwarded-to Numbers, otherwise shall be absent.
Forwarded-to subaddress 2CSubaddress of the C subscriber (see TS 23.003) for the less preferred service of a SCUDIF call. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is to be forwarded and a forwarded-to subaddress is stored in the HLR in association with the forwarded-to number 2, otherwise shall be absent.
Notification to calling party 2CIndication of whether the calling party is to be notified that the call has been forwarded if the less preferred service of a SCUDIF call is kept. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is to be forwarded, otherwise shall be absent.
Forwarding reason 2CIndication of why the call has been forwarded (unconditionally or on mobile subscriber not reachable) for the less preferred service of a SCUDIF call. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is to be forwarded, otherwise shall be absent.
SS-List 2CList of SS-codes for the less preferred service of a SCUDIF call. Shall be present if the HLR has determined that the less preferred service of a SCUDIF call is allowed, otherwise shall be absent.
Basic Service Code 2CIndicates the type of the basic service for the less preferred service, i.e. teleservice or bearer service.
Allowed ServicesCShall be present for SCUDIF calls. Indicates which services are available for that call.
Unavailability CauseCIndicates the reason for which one of the services of a SCUDIF call is not available. Shall be present for SCUDIF calls if one service is not available.
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