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GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

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Page 410<br />

<strong>GSM</strong> <strong>09.02</strong> <strong>Version</strong> <strong>5.3.0</strong>: August 1996<br />

18.2 Retrieval of routing information<br />

18.2.1 General<br />

The procedure is shown in figure 18.2/1; the sequence only assumes successful operation.<br />

Notes:<br />

1HWZRUN *DWHZD\<br />

¸¹ ¸¹ ¸¹ ¸¹<br />

· ¼½06&¼½+/5¼ ½9/5·<br />

º¾» º¾» º¾» º¾»<br />

·,B,$0 QRWH ·0$3B6(1'B5287,1*B · ·<br />

¼!·,1)250$7,21 · ·<br />

· ¸¹ ¼!· ·<br />

· ·06&¼½ QRWH ·0$3B3529,'(B52$0,1*B·<br />

· º¾» · · 180%(5 ·<br />

· · · ¼ !·<br />

· · · ·0$3B3529,'(B52$0,1*B·<br />

· · · · 180%(5 DFN ·<br />

· · · 0$3B6(1'B5287,1*B¼ ½<br />

· · · ,1)250$7,21 DFN · ·<br />

· · · ½ 0$3B5(6725(B'$7$ ·<br />

· · , ,$0 · · ·<br />

· ¼ ½ · ·<br />

· · · · ·<br />

xxx = Optional Procedure<br />

NOTE 1: This service may also be used by an ISDN exchange for obtaining routing information from the<br />

HLR.<br />

NOTE 2: TUP or ISUP may be used in signalling between MSCs, depending on the network type<br />

between the MSCs. For further details on the TUP and ISUP procedures refer to the following<br />

CCITT Recommendations:<br />

Q.721-725 - Telephone User Part (TUP);<br />

Q.761-764 - ISDN User Part (ISUP).<br />

Figure 18.2/1: Procedure for retrieval of routing information<br />

It is assumed that signalling towards the fixed network uses the messages IAM (Initial Address Message)<br />

and REL (Release). Examples of other interworking cases are not shown in this standard (for further<br />

information see CCITT Recommendation Q.699).<br />

The following MAP services are used to retrieve routing information:<br />

MAP_SEND_ROUTING_INFORMATION see subclause 8;<br />

MAP_PROVIDE_ROAMING_NUMBER see subclause 8;<br />

MAP_RESTORE_DATA see subclause 6.

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