5 Messages and their Contents

23.0723GPPCall Deflection (CD) supplementary serviceRelease 17Stage 2TS

5.1 Messages between the MS and the MSC

5.1.1 CD Request

The CD Request message is sent from the MS to MSC direction.

Information element name	Required	Description
Deflected-to number	M	Number of the C subscriber as entered by the served subscriber.
Deflected-to subaddress	C	Subaddress of the C subscriber; shall be present if it was entered by the served subscriber; otherwise shall be absent

5.1.2 CD Request ack

The CD Request ack message is sent from the MSC to MS direction. This message contains no information elements.

5.1.3 CD Request negative response

CD Request negative response message is sent from the MSC to MS direction. The negative response information element can take the following values:

– service not subscribed;

– deflected-to number is own number;

– deflected-to number is a special service code;

– number invalid;

– call barred;

– SS incompatibility;

– forwarding violation;

– forwarding failure.

5.2 Messages between the MSC and the VLR

5.2.1 Process Call Waiting negative response

For the description of the Process Call Waiting negative response message refer to TS 23.018. The negative response information element can take the following additional value:

– Call Deflection.

For the purpose of the CD supplementary service the following additional information elements for the Process Call Waiting negative response message are required.

Information element name	Required	Description
Deflected-to number	M	Number of the C subscriber as entered by the served subscriber.
Deflected-to subaddress	C	Subaddress of the C subscriber; shall be present if it was entered by the served subscriber; otherwise shall be absent

5.2.2 Complete Call negative response

For the description of the Complete Call negative response message refer to TS 23.018. The negative response information element can take the following additional value:

– Call Deflection.

For the purpose of the CD supplementary service the following additional information elements for the Complete Call negative response message are required.

Information element name	Required	Description
Deflected-to number	M	Number of the C subscriber as entered by the served subscriber.
Deflected-to subaddress	C	Subaddress of the C subscriber; shall be present if it was entered by the served subscriber; otherwise shall be absent

5.2.3 Send Info for Incoming Call negative response

For the description of the Send Info for Incoming Call negative response message refer to TS 23.018. The negative response information element can take the following additional values:

– service not subscribed;

– deflected-to number is own number;

– deflected-to number is a special service code;

– number invalid;

– call barred.