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ITU-T Q.953.4 (10/1995)

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Stage 3 description for call completion supplementary services using DSS 1 : Terminal Portability (TP)
This Recommendation defines the operation of the Digital Subscriber Signalling System No. 1 (DSS 1) for the support of the Terminal Portability (TP) supplementary service at the T or the coincident S and T reference point of the User-to-Network Interface of the Integrated Services Digital Network (ISDN). The Terminal Portability supplementary service allows the user to temporarily suspend an active call, and subsequently reactivate it from the same terminal equipment or from another one within the same user-network interface.
Citation: https://handle.itu.int/11.1002/1000/3221
Series title: Q series: Switching and signalling, and associated measurements and tests
  Q.850-Q.999: Digital subscriber Signalling System No. 1
  Q.950-Q.959: Stage 3 description for supplementary services using DSS1
Approval date: 1995-10-17
Approval process:TAP
Status: In force
Maintenance responsibility: ITU-T Study Group 11
Further details: Patent statement(s)