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TS 02.91 (SA1)
Explicit Call Transfer (ECT) supplementary service – Stage 1

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(P) GSM Rel-98 v7.0.0    1999/06    16 p.
(P) GSM Rel-97 v6.0.0    1998/10    16 p.
(P) GSM Rel-96 v5.1.1    1997/02    17 p.

Rapporteur:  SWETINA, Joerg
Descendant:  TS 22.091    
See also:  ECT-related TS/TR    

This TS specifies the stage 1 description of Explicit Call Transfer (ECT) from the service subscriber's and user's points of view.

Here is a short description of the ECT service:
  • The ECT supplementary service enables the served mobile subscriber (subscriber A) who has two calls , each of which can be an incoming or outgoing call, to connect the other parties in the two calls and release the served mobile subscribers own connection.
  • Prior to transfer, the connection shall have been established on the call between subscriber A and subscriber B. On the call between subscriber A and subscriber C, either the connection shall have been established prior to transfer, or, as a network option, transfer can occur while subscriber C is being informed of the call (i.e. the connection has not yet been established.)
  • This service is applicable to telephony (Teleservice 11) only.


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1 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Description    4.1 Applicability to telecommunication services    5 Normal operation with successful outcome    5.1 Provision    5.2 Withdrawal    5.3 Registration    5.4 Erasure    5.5 Activation    5.6 Deactivation    5.7 Invocation    5.8 Normal operation    5.9 Interrogation    5.10 Charging requirements    6 Exception procedures or unsuccessful outcome    7 Alternate procedures    8 Interaction with other supplementary services    8.1 Calling Line Identification Presentation (CLIP)    8.2 Calling Line Identification Restriction (CLIR)    8.3 Connected Line Identification Presentation (COLP)    8.4 Connected Line Identification Restriction (COLR)    8.5 Call Forwarding Unconditional (CFU)    8.6 Call Forwarding on mobile subscriber Busy (CFB)    8.7 Call Forwarding on No Reply (CFNRy)    8.8 Call Forwarding on mobile subscriber Not Reachable (CFNRc)    8.9 Call Waiting (CW)    8.10 Call Hold (HOLD)    8.11 Multi-party (MPTY) service    8.12 Closed User Group (CUG)    8.13 Advice of Charge (AoC)    8.14 Barring of All Outgoing Calls (BAOC)    8.15 Barring of all Outgoing International Calls (BOIC)    8.16 Barring of all Outgoing International Calls except those direct to the Home PLMN Country (BOICexHC)    8.17 Barring of All Incoming Calls (BAIC)    8.18 Barring of Incoming Calls when roaming outside the home PLMN country (BIC-Roam)    8.19 Call Transfer (CT)    9 Interworking considerations    A Deviations of GSM ECT to the ISDN specifications of ECT    A.1 Subclause 4.1 Applicability to telecommunication services    A.2 Subclause 5.8 Normal operation    A.3 Subclause 6 Exception procedures or unsuccessful outcome    A.4 Subclause 8.6 and 8.7    A.5 Annexes    B [N] Cross Phase compatibility    C Change Request History   


1   Scope   PDF-p. 6
2   References
3   Definitions and abbreviations
4   Description
5   Normal operation with successful outcome
6   Exception procedures or unsuccessful outcome
7   Alternate procedures
8   Interaction with other supplementary services      Up
9   Interworking considerations      Up
A   Deviations of GSM ECT to the ISDN specifications of ECT   PDF-p. 13
B  (Normative)   Cross Phase compatibility   PDF-p. 14
C   Change Request History   PDF-p. 15

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