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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   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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