Content for TS 23.079 Word version: 18.0.0
10 Contents of messages
10.1 Messages on the B interface (MSC-VLR)
10.2 Messages on the C interface (MSC-HLR)
10.3 Messages on the D interface (VLR-HLR)
10.4 Messages on the E interface (MSC-MSC)
10 Contents of messages p. 34
This clause specifies the changes to the content of each message shown in clauses 5, 6 and 9, including those messages which are already specified for UMTS but which require changes for Optimal Routeing. It should be read as a 'delta' on the corresponding clause of TS 23.018; those information elements which are the same for SOR as for the basic call without OR are not specified in this clause.
In the tables which follow, information elements are shown as mandatory (M) or conditional (C). A mandatory information element shall always be present. A conditional information element shall be present if certain conditions are fulfilled; if those conditions are not fulfilled it shall be absent.
10.1 Messages on the B interface (MSC-VLR) p. 35
10.1.1 Send Info For Outgoing Call p. 35
This message is specified in TS 23.018.
10.1.2 Send Info For Outgoing Call negative response p. 35
This message is specified in TS 23.018.
10.1.3 Send Info For Incoming Call p. 35
This message is specified in TS 23.018.
10.1.4 Send Info For Incoming Call ack p. 35
This message is specified in TS 23.018. The following additional information elements are required:
| Information element names | Required | Description |
|---|---|---|
| OR indicator | C | Indicates whether the call has been routed directly from a GMSC not in the same PLMN as the HLR. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
| GMSC address | C | E.164 address of the GMSC. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
| Call reference number | C | Call reference number used by the GMSC for this call. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
| OR not supported in GMSC | C | Indicates that the GMSC does not support Optimal Routeing. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
10.1.5 Send Info For Incoming Call negative response p. 35
This message is specified in TS 23.018.
10.1.6 Complete Call p. 35
This message is specified in TS 23.018. The following additional information elements are required:
| Information element names | Required | Description |
|---|---|---|
| OR indicator | C | Indicates whether the call has been routed directly from a GMSC not in the same PLMN as the HLR. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
| GMSC address | C | E.164 address of the GMSC. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
10.1.7 Process Call Waiting p. 36
This message is specified in TS 23.018. The following additional information elements are required:
| Information element names | Required | Description |
|---|---|---|
| OR indicator | C | Indicates whether the call has been routed directly from a GMSC not in the same PLMN as the HLR. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
| GMSC address | C | E.164 address of the GMSC. Shall be present if it was received in the Provide Roaming Number, otherwise shall be absent. |
10.2 Messages on the C interface (MSC-HLR) p. 36
10.2.1 Send Routeing Info p. 36
This message is specified in TS 23.018. The following additional information elements are required:
| Information element names | Required | Description |
|---|---|---|
| Interrogation type | M | Indicates the type of interrogation: basic(for routeing information for an MT call) or forwarding (when the GMSC has been asked to resume call handling for OR of late call forwarding). |
| OR interrogation indicator | C | Indicates that the interrogation is from a GMSC not in the same PLMN as the HLR. Shall be present if the interrogation is from a GMSC not in the same PLMN as the HLR, otherwise shall be absent. |
| OR capability | C | Indicates the phase of OR which the GMSC supports. Shall be present if the GMSC supports OR, otherwise shall be absent. |
| GMSC or gsmSCF address | M | E.164 address of the GMSC. |
| Call reference number | C | Call reference number used by the GMSC for this call. Shall be present if the interrogation type=basic call, otherwise shall be absent. |
| Forwarding reason | C | Indicates the reason for forwarding (on busy, on no subscriber reply, or on mobile subscriber not reachable). Shall be present if the Interrogation type=forwarding, otherwise shall be absent. |
| Basic service group | C | Basic service group which applies for this call. Shall be present if the Interrogation type=forwarding, otherwise shall be absent. |
| Basic service group 2 | C | Basic service group which applies for this call. Shall be present if the Interrogation type=forwarding and if the VMSC has determined that the forwarded call is to be treated as a SCUDIF call in accordance with the rules in TS 23.172, otherwise shall be absent. |
10.2.2 Send Routeing Info ack p. 37
This message is specified in TS 23.018. Two new information elements are required, and the condition for the presence of one existing information element is changed, as shown in the following table.
| Information element names | Required | Description |
|---|---|---|
| Forwarding interrogation required | C | Indicates that the GMSC shall interrogate the HLR for routeing information for late call forwarding. Shall be present if the SRI ack contains an MSRN and GMSC has to interrogate the HLR for routeing information for late call forwarding, otherwise shall be absent. |
| VMSC address | C | E.164 address of the VMSC in whose area the B subscriber is currently registered. Shall be present in the Send Routeing Info ack if the OR interrogation indicator in the Send Routeing Info was present and the HLR supports optimal routeing of basic mobile-to-mobile calls and the HLR has not determined that the call is to be forwarded, otherwise shall be absent. |
| Roaming number | C | E.164 address required to route the call to the VMSC of the B party. Shall be present in the Send Routeing Info ack which is sent in response to a Send Routeing Info with Interrogation type=basic if the HLR has determined that the charging requirements for optimal routeing are not contravened and that the call is not to be forwarded, otherwise shall be absent. |
10.2.3 Send Routeing Info negative response p. 37
10.3 Messages on the D interface (VLR-HLR) p. 37
10.3.1 Provide Roaming Number p. 37
This message is specified in TS 23.018. The following additional information elements are required:
| Information element names | Required | Description |
|---|---|---|
| GMSC address | C | E.164 address of the GMSC. Shall be present if it was received by the HLR in the Send Routeing Info, otherwise shall be absent. |
| Call reference number | C | Call reference number used by the GMSC for this call. Shall be present if it was received by the HLR in the Send Routeing Info, otherwise shall be absent. |
| OR interrogation indicator | C | Indicates that the HLR received the corresponding Send Routeing Info from a GMSC not in the same PLMN as the HLR. Shall be present if the HLR received the Send Routeing Info from a GMSC not in the same PLMN as the HLR, otherwise shall be absent. |
| OR not supported in GMSC | C | Indicates that the GMSC does not support OR, and that RCH shall not be sent for optimal routing. Shall be present if the HLR received the Send Routeing Info from the GMSC without the OR-capability information Element, otherwise it shall be absent. |
10.3.2 Provide Roaming Number ack p. 37
This message is specified in TS 23.018.
10.3.3 Provide Roaming Number negative response p. 38
This message is specified in TS 23.018.
10.3.4 Provide Subscriber Information p. 38
This message is specified in TS 23.018.
10.3.5 Provide Subscriber Information ack p. 38
This message is specified in TS 23.018.
10.4 Messages on the E interface (MSC-MSC) p. 38
10.4.1 Resume Call Handling p. 38
The following information elements are required:
| Information element names | Required | Description |
|---|---|---|
| Call reference number | M | Call reference number used by the GMSC for this call. |
| Forwarding reason | C | Indicates the reason for forwarding (on call deflection, on busy, on no subscriber reply, or on mobile subscriber not reachable). Shall be present if the call is forwarded other than for the MT roaming retry reason. |
| Basic service group | M | Basic service group which applies for this call. For SCUDIF calls, see TS 23.172 for the use of this information element. |
| IMSI | M | IMSI of the B subscriber. |
| Forwarded-to number | C | E.164 number of the C subscriber. Shall be present if the call is forwarded other than for the MT roaming retry reason. |
| Notification to calling party | C | Indication of whether the calling party is to be notified that the call has been forwarded. Shall be present if the call is forwarded other than for MT roaming retry reason. |
| Forwarded-to subaddress | C | Subaddress of the C subscriber (see TS 23.003). Shall be present if a forwarded-to subaddress is stored in the VLR in association with the forwarded-to number; otherwise shall be absent. |
| Redirecting presentation | C | Indication of whether the MSISDN of the B subscriber shall be presented to the C subscriber. Shall be present if VMSCB supports the handling of the redirecting number, otherwise shall be absent. |
| MSISDN | C | E.164 number which identifies the B subscriber. It will be used to create the redirecting number presented to the C subscriber. Shall be present if VMSCB supports the handling of the redirecting number, otherwise shall be absent. |
| CUG interlock | C | For the definition of this IE, see TS 23.085. Shall be present if the VLR has determined that the forwarded call is to be treated as a CUG call in accordance with the rules in TS 23.085, otherwise shall be absent. |
| CUG outgoing access | C | For the definition of this IE, see TS 23.085. Shall be present if the VLR has determined that the forwarded call is to be treated as a CUG call with outgoing access in accordance with the rules in TS 23.085, otherwise shall be absent. |
| Basic service group 2 | C | For the definition of this IE, see TS 23.172. Shall be present if the VMSC has determined that the forwarded call is to be treated as a SCUDIF call in accordance with the rules in TS 23.172, otherwise shall be absent. |
| MT Roaming Retry | C | Indication that the call is forwarded for MT roaming retry. All other forwarding parameters are not relevant if this IE is present. |
10.4.2 Resume Call Handling ack p. 38
This message contains no information elements.
10.4.3 Resume Call Handling negative response p. 39
The negative response information element can take the following values:
- OR not allowed.
- Forwarding failed.
