INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : Q.767

Title :	Application of the ISDN user part of CCITT signalling 
	system No. 7 for international ISDN interconnections

Study Group : XI - Switching and Signalling

Version : New

Date of adoption : 1991

Notes :	


ISDN international interconnections have to be realized between non 
homogeneous ISDNs that differ in terms of services supported, national 
network signalling system and national access protocol.

In order to perform such international ISDN interconnections, it is 
required to specify unambiguously and without options:

	- the service capabilities of the international signalling 
	  system;

	- the international signalling interface, i.e., the signalling 
	  information elements and messages sent and received on the 
	  international signalling section and the related procedures;

	- all additional information, which is not specifically 
	  signalling system related, but which is needed to absorb the 
	  potential differences between the national networks.

Section 2 of Recommendation Q.767 describes the list of services 
supported by the ISUP international interface.

Section 3 contains the definition of the international ISUP signalling 
specification, in terms of exceptions/clarifications to the existing 
Blue Book ISUP text.

Section 4 contains additional information to ease international ISDN 
interconnections. This "Guidelines" section should be understood as a 
"user's guide" for international ISDN interconnection. One of the 
objectives is to highlight possible areas of difficulty and propose 
standard solutions, that should be applied as far as possible by 
international operators.



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