Content for  TS 23.066  Word version:  18.0.0

Figure B.4.4 shows the MNP-SRF operation for delivering an SMS message to a ported number where the interrogating network supports direct routeing. The message flows for this scenario are based on the use of an SCCP-relay function in the MNP-SRFs. If the MNP-SRFs use a higher-level relay function (e.g. TC-relay), then the response message will go via the MNP-SRF as shown in clause B.4.2. For further details of the signalling relay functions, the reader is referred to [7].

1. The SMSC forwards a SM to the SMS-GMSC via a proprietary interface.
2. The SMS-GMSC generates a routeing enquiry for SM delivery. The MAP SRI_for_SM message is routed to the network's MNP-SRF.
3. When MNP-SRFA receives the message, MNP-SRF operation is triggered. The MNP-SRF functionality analyses the MSISDN in the CdPA and identifies the MSISDN as being ported using information which may be retrieved from an NP database. As the message is non-call related, the MNP-SRF function then populates the CdPA with either a routeing number or a concatenation of a routeing number and MSISDN. After modifying the CdPA, the message is routed to MNP-SRFB in the subscription network.
4. When MNP-SRFB receives the message, MNP-SRF operation is triggered. The MNP-SRF functionality analyses the MSISDN in the CdPA and identifies the MSISDN as being ported into the network using information which may be retrieved from an NP database. The MNP-SRF function then populates the CdPA with an HLRB address. After modifying the CdPA, the message is routed to HLRB.
5. HLRB responds to the routeing enquiry by sending back an SRI_for_SM ack with the address of the VMSC.
6. The SMS-GMSC can now deliver the message to the VMSCB using a Forward_SMS message.
7. VMSCB further delivers the message to MSB.

Figure B.4.5 shows the MNP-SRF operation for optimally routeing an international call to a non-ported number. The message flows for this scenario are based on the use of an SCCP-relay function in the MNP-SRF. If the MNP-SRF uses a higher-level relay function (e.g. TC-relay), then the response message will go via the MNP-SRF as shown in clause B.4.2. For further details of the signalling relay functions, the reader is referred to [7].

1. MSA originates a call to MSISDN.
2. VMSCA routes the call to the originating network's GMSCA.
3. When GMSCA receives the ISUP IAM, it requests routeing information by submitting a MAP SRI with SOR parameter set to the number range holder network of the dialled MSISDN. Within the number range holder network, the message is routed to the network's MNP-SRF.
4. When MNP-SRFB receives the message, MNP-SRF operation is triggered. The MNP-SRF functionality analyses the MSISDN in the CdPA and identifies the MSISDN as being non-ported using information which may be retrieved from an NP database. The MNP-SRF function then populates the CdPA with an HLRB address. After modifying the CdPA, the message is routed to HLRB.
5. When HLRB receives the SRI, it responds to the GMSCA by sending back an SRI ack with a MSRN.
6. GMSCA uses the MSRN to route the call to VMSCB.
7. VMSCB further establishes a traffic channel to MSB.

Figure B.4.6 shows the MNP-SRF operation for optimally routeing a call (using SOR) to a ported number where the interrogating network does not support direct routeing. The message flows for this scenario are based on the use of an SCCP-relay function in the MNP-SRFs. If the MNP-SRFs use a higher-level relay function (e.g. TC-relay), then the response message will go via the MNP-SRF as shown in clauseB.4.2. For further details of the signalling relay functions, the reader is referred to [7].

1. MSA originates a call to MSISDN.
2. VMSCA routes the call to the network's GMSCA.
3. When GMSCA receives the ISUP IAM, it requests routeing information by submitting a MAP SRI with SOR parameter set to the number range holder network of the dialled MSISDN. Within the number range holder network, the message is routed to the network's MNP-SRF.
4. When MNP-SRFB' receives the message, MNP-SRF operation is triggered. The MNP-SRF functionality analyses the MSISDN in the CdPA and identifies the MSISDN as being ported using information which may be retrieved from an NP database. As the message is non-call related, the MNP-SRF function then populates the CdPA with either a routeing number or a concatenation of a routeing number and MSISDN. After modifying the CdPA, the message is routed to MNP-SRFB in the subscription network.
5. When MNP-SRFB receives the message, MNP-SRF operation is triggered. The MNP-SRF functionality analyses the MSISDN in the CdPA and identifies the MSISDN as being ported into the network using information which may be retrieved from an NP database. The MNP-SRF function then populates the CdPA with an HLRB address. After modifying the CdPA, the message is routed to HLRB.
6. When HLRB receives the SRI, it responds to the GMSCA by sending back an SRI ack with a MSRN.
7. GMSCA uses the MSRN to route the call to VMSCB.
8. VMSCB further establishes a traffic channel to MSB.