A supplementary service modifies or supplements a basic teleservice. Consequently, it
cannot be offered to a customer as a stand alone service, only in association with a basic
teleservice. The same supplementary service may be applicable to a number of teleservices.
• Are used only in connection with a teleservice
• Examples of supplementary services include:
• Call forwarding
• Call Barring (incoming/outgoing calls)
• Call hold - interrupting a call - normal telephony only
• Call waiting - notification of new incoming call during another call
• Multi-party service - simultaneous conversation between 3 - 6 subscribers
• Calling line identification (CLI) - presentation of callers number
• Closed user groups - group of users who can only call each other and certain
specified numbers
• Advice of charge - estimates of billing data
cannot be offered to a customer as a stand alone service, only in association with a basic
teleservice. The same supplementary service may be applicable to a number of teleservices.
Suppllementtarryy Seerrvviicceess
• Correspond to ISDN supplementary services• Are used only in connection with a teleservice
• Examples of supplementary services include:
• Call forwarding
• Call Barring (incoming/outgoing calls)
• Call hold - interrupting a call - normal telephony only
• Call waiting - notification of new incoming call during another call
• Multi-party service - simultaneous conversation between 3 - 6 subscribers
• Calling line identification (CLI) - presentation of callers number
• Closed user groups - group of users who can only call each other and certain
specified numbers
• Advice of charge - estimates of billing data