A.4 Contents of messages

03.663GPPStage 2Support of GSM Mobile Number Portability (MNP)TS

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

This clause specifies the content of the following messages:

On the ISUP interface:

IAM;

On the MSC – NPDB interface:

INITIAL DP

CONTINUE

CONNECT;

In the tables which follow, information elements are shown as mandatory (M), conditional © or optional (O). 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. An optional element may be present or absent, at the discretion of the application at the sending entity.

A.4.1 Messages on the ISUP interface

A.4.1.1 IAM

This message is specified in [7]. It is necessary for the IAM to contain the information needed to route the call to the subscription network of the ported subscriber. The ways in which this may be coded are shown in [7].

A.4.2 Messages on the MSC – NPDB interface

A.4.2.1 INITIAL DP

This message is specified in [6].The following information elements are required:

Information element name	Required	Description
Service Key	M	Identifies the requested IN service (MNP query).
Called Party Number	M	The possibly ported MSISDN

A.4.2.2 INITIAL DP negative response

This message is specified in [6].The negative response information element can take the following values:

missing parameter;
unexpected data value.

A.4.2.3 CONNECT

This message is specified in [6]. It shall be ensured that the information in the Connect message shall be aligned with the coding supported in the ISUP signalling.

A.4.2.4 CONTINUE

This message does not contain any information element.

Annex B (normative):
Handling of Non-Call Related Signalling