7 Explicit call transfer
7.1 Scope
7.2 References
7.3 Definitions
7.4 Abbreviations
7.5 Description
7.6 Operational requirements
7.6.1 Provision and withdrawal
7.6.2 Requirements on the originating network
side
7.6.3 Requirements on the destination network
side
7.7 Coding requirements
7.7.1 Coding of the Facility information
element components
7.7.2 Coding of the Notification indicator
information element
7.7.3 Coding of the Redirection number
information element
7.8 State definitions
7.9 Signalling procedures at the coincident S and T reference
point
7.9.1 Activation, deactivation and registration
7.9.2 Invocation and operation
7.9.3 Content of notification information
7.10 Procedures for interworking with private ISDNs
7.10.1 Call transfer performed in the private
network, served user is connected to the private ISDN
7.10.2 Call transfer performed in the public
network, remote user is connected to the private ISDN
7.10.3 Procedures for the mechanism to avoid
looping of uncontrolled circuits
7.10.4 Call transfer performed by the public
ISDN, served user is connected to the private ISDN
7.11 Interactions with other networks
7.12 Interaction with other supplementary services
7.12.1 Call Waiting
7.12.2 Call Transfer
7.12.3 Connected Line Identification
Presentation
7.12.4
Connected Line Identification Restriction
7.12.5 Calling Line Identification Presentation
7.12.6 Calling Line Identification Restriction
7.12.7 Closed User Group
7.12.8 Conference
Calling
7.12.9 Direct-Dialling-In
7.12.10 Call Diversion services
7.12.11 Line Hunting
7.12.12 Three-Party Service
7.12.13 User-to-User Signalling
7.12.14 Multiple Subscriber Number
7.12.15 Call Hold
7.12.16 Advice of Charge
7.12.17 Sub-addressing
7.12.18 Terminal Portability
7.12.19
Completion of Calls to Busy Subscribers
7.12.20 Malicious Call Identification
7.12.21 Reverse Charging
7.12.22 Multi-level Precedence and Preemption
7.12.23 Support of Private Numbering Plans
7.13 Parameter values (timers)
7.14 Dynamic description (SDL diagrams)
7.14.1 User side SDL
7.14.2 Network side SDL
Appendix I – Signalling flows