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Content for  TS 23.079  Word version:  17.0.0

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1  Scopep. 5

The present document specifies the technical realisation of the first phase of the network feature Support of Optimal Routeing (SOR). The first phase of SOR provides:
  • as a network operator option, a method to route a call from one mobile subscriber directly to another mobile subscriber who is in the same country as the calling mobile subscriber or in the called mobile subscriber's home country, without needing to connect the call via the HPLMN of the called subscriber, even though the called mobile subscriber has roamed outside his HPLMN;
  • a method to forward calls when a called mobile subscriber who has roamed outside his home country is busy, or is not reachable, or does not reply, to a forwarded-to destination in the HPLMN country of the called subscriber or the VPLMN country of the called subscriber, without needing to connect the forwarded call via the VPLMN of the called subscriber;
  • a method to combine the optimal routeing described in the first bullet point above with the optimal routeing described in the second bullet point above.
OR of a call is permitted only if all entities involved in handling the call support OR.
Other cases of optimal routeing (e.g. calls where the calling and called subscribers are in different countries, forwarding to a mobile subscriber or multiple forwarding) will be considered for inclusion in later phases.
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2  Referencesp. 5

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
GSM 03.04: "Digital cellular telecommunications system (Phase 2+); Signalling requirements relating to routeing of calls to mobile subscribers".
[2]
TR 21.905: "Vocabulary for 3GPP Specifications".
[3]
TS 22.079: "Support of Optimal Routeing (SOR); Service definition - Stage 1".
[4]
TS 22.082: "Call Forwarding (CF) supplementary services - Stage 1".
[5]
TS 23.003: "Numbering, addressing & identification".
[6]
TS 23.018: "Basic call handling; Technical realization".
[7]
TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) - Phase 3; Stage 2".
[8]
TS 23.085: "Closed User Group (CUG) Supplementary Service - Stage 2".
[9]
TS 23.087: "User -to-User Signalling (UUS) - Stage 2".
[10]
TS 23.172: "Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification"
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3  Definitions and abbreviationsp. 6

3.1  Definitionsp. 6

For the purposes of the present document, the following terms and definitions apply.
A subscriber:
calling subscriber, who may be fixed or mobile
B subscriber:
mobile subscriber originally called by the A subscriber
C subscriber:
subscriber to whom the B subscriber has requested that calls be forwarded. The C subscriber may be fixed or mobile
Direct route:
call takes the direct route if the route from the serving PLMN of the A subscriber to the serving PLMN of the B subscriber is defined by the MSRN of the B subscriber rather than by the MSISDN of the B subscriber
Early call forwarding:
call forwarding from the IPLMN before the call has been extended to the VPLMN of the forwarding subscriber
HPLMN leg:
portion of the HPLMN route from the serving MSC of the A subscriber to an MSC in the HPLMN of the B subscriber
HPLMN route:
call takes the HPLMN route if the route from the serving MSC of the A subscriber to the serving MSC of the B subscriber is defined by the MSISDN of the called subscriber. This forces the call to be routed via the HPLMN of the B subscriber
Interrogating PLMN (IPLMN):
PLMN which interrogates the HPLMN of the B subscriber to obtain information to route the call to that subscriber or to the forwarded-to destination defined by the called mobile subscriber. The IPLMN is also the VPLMN of the A subscriber
Late call forwarding:
call forwarding after the call has been extended to the VPLMN of the forwarding subscriber. Late call forwarding may be invoked in the IPLMN or the VPLMN of the forwarding subscriber
Reference address:
address which defines the maximum charge which the A party is prepared to pay for the call leg which he originates
Routeing address:
address which the GMSC uses to route a call towards the B subscriber or the C subscriber
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3.2  Abbreviationsp. 7

Abbreviations used in the present document are listed in TS 21.905.
For the purposes of the present document, the following abbreviations apply:
BOIZC
Barring of Outgoing InterZonal Calls
BOIZC-exHC
Barring of Outgoing InterZonal Calls except those directed to the HPLMN Country
CMN
CAMEL Modified Number
FTN
Forwarded-To Number
FTNW
Forwarded-To NetWork
GMSCA
The GMSC in the IPLMN, which may also be VMSCA
GMSCB
The GMSC in HPLMNB
GMSCC
The GMSC in HPLMNC
HLRB
The HLR of the B subscriber
HLRC
The HLR of the C subscriber
HPLMNB
The HPLMN of the B subscriber
HPLMNC
The HPLMN of the C subscriber
IAM
Initial Address Message
IPLMN
Interrogating PLMN
ORLCF
Optimal Routeing for Late Call Forwarding
PRN
Provide Roaming Number
PSI
Provide Subscriber Information
RCH
Resume Call Handling
SIFIC
Send Information For Incoming Call
SIFOC
Send Information For Outgoing Call
SRI(B)
Send Routeing Information (Basic call)
SRI(F)
Send Routeing Information (Forwarding information)
VLRA
The VLR of the A subscriber
VLRB
The VLR of the B subscriber
VMSCA
The VMSC of the A subscriber
VMSCB
The VMSC of the B subscriber
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