1
Scope
2 References
3 Definitions
4 Abbreviations
5 Conventions
6 Call control and signalling
procedures
6.1 Separate Directory Number
Addressing method
6.1.1 Handling of network routing number and directory number
6.1.2 Handling of an incomplete directory number
6.2 Other addressing methods
6.3 Actions required in the
originating network
6.3.1 Onward Routing
6.3.2 All Call Query
6.4 Actions required in the donor
network
6.4.1 Onward Routing
6.4.2 All Call Query
6.5 Actions required in a transit
network
6.5.1 Onward Routing
6.5.2 All Call Query
6.6 Actions required in the recipient
network
Annex A – Procedures for the Concatenated Addressing
method
A.1 General
A.2 Exceptions to clause 6 of this
Recommendation
Annex B – Procedures for the Separate Network Routing
Number Addressing method
B.1 General
B.2 Exceptions to clause 6 of this
Recommendation
Annex C – Procedures to support Query on Release
C.1 General
C.2 Procedures for QoR with the
forward and the backward indications
C.2.1 Normal procedures
C.2.2 Exceptional procedures
C.3 Procedures for QoR with the
backward indication only
C.3.1 Normal procedures
C.3.2 Exceptional procedures
Annex D – Procedures to support Dropback
D.1 General
D.2 Actions required in the networks
involved in the first leg
D.2.1 Actions required in the originating network
D.2.2 Actions required in the transit network
D.2.3 Actions required in the donor network
D.3 Actions required in the networks
involved in the second leg
D.3.1 Actions required in the transit network
D.3.2 Actions required in the rerouting network
D.4 Actions required in the networks
involved in the third leg
D.4.1 Actions required in a transit network
D.4.2 Actions required in the recipient network
Annex E – Procedures for forward transfer of number
portability status information
E.1 General
E.2 Normal procedures
E.2.1 Actions required at an initiating
exchange
E.3 Exceptional procedures