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• ITU-T RECOMMENDATION I.253.2 (1988)
• 2 I.253.2 - Call Hold
  • 2.1 Definition
  • 2.2 Description
  • 2.3 Procedures
  • 2.4 Network capabilities for charging
  • 2.5 Interworking requirements
  • 2.6 Interactions with other supplementary services
  • 2.7 Dynamic description