CONTENTS

1 Introduction
2 Scope
3 References
4 Definitions
5 Abbreviations
6 Description of an international route
7 General routing principles
8 Specific routing possibilities through the International PDN
8.1 Routing possibilities required for maintaining the quality of service
8.2 Service characteristics associated with a route
8.3 Specific conditions associated with a route
9 Routing procedures applicable to international interworking between PDNs of the same type, between PSPDNs and ISDNs/PSTN and also between PFRDNs and ATM networks
9.1 Use of DNICs
9.2 Number plan interworking
9.2.1 Use of escape codes to facilitate number plan interworking
9.2.2 Significance of escape codes for routing
9.3 Number plan interworking for frame relay and ATM Networks
10 Identification of IDSEs and ISDNs involved in an international call
11 Multiple IDSEs provided within one Country or Administration
11.1 In the originating or destination country
11.2 In a transit country
12 International routing plan
13 Network information required to enable optimum routings to be planned
Annex A Terms and definitions related to routing in the PDN
Annex B The use of satellite links in overall PDN routes
B.1 General considerations
B.2 Principles in each PDN
B.2.1 Originating national PDN
B.2.2 Originating/transit IDSEs
B.2.3 Destination IDSE
B.2.4 Destination national PDN
Annex C Routing information
Annex D International routing plan Examples of routes
D.1 Introduction
D.2 Examples of typical routes
D.2.1 Direct route (high usage route)
D.2.2 Routes via intermediate countries (low volumes of traffic)
D.2.3 Alternative route
D.2.4 Routing plan in cases where direct routes are provisioned
D.2.5 Routing plan in cases where direct routes are not provisioned
D.3 Rerouting