TS 03.91 – Explicit Call Transfer Supplementary Service
3GPP TS 03.91 is the 3GPP Technical Specification for Explicit Call Transfer Supplementary Service. It is published in 3 releases (R96 to R98); the latest version is 7.0.0 in R98.
Defines Explicit Call Transfer (ECT) supplementary service for transferring active calls between parties without subscriber participation.
Releases and versions of TS 03.91
| Release | Latest version | Links |
|---|---|---|
| R98 | 7.0.0 | Read · Download (3GPP) |
| R97 | 6.0.0 | Read · Download (3GPP) |
| R96 | 5.0.2 | Read · Download (3GPP) |
Scope of TS 03.91
Category: Services (Supplementary Services). Technology generation: 2G. Network layer: Services.
Who should read this specification?
- Network operators
- Device manufacturers
- Regulators and standards bodies
Implementation notes
Complexity level: Intermediate. Implementation difficulty: Medium.
Key technologies
Other specifications in the 03 series
- TS 03.86 Advice of Charge Supplementary Services
- TS 03.87 User-to-User Signalling Supplementary Services
- TS 03.88 Call Barring Services Stage 2 Description
- TS 03.90 Unstructured Supplementary Service Data (USSD)
- TS 03.93 Completion of Calls to Busy Subscriber
- TS 03.96 Calling Name Presentation Supplementary Service
- TS 03.97 Multiple Subscriber Profile Phase 1
Related glossary terms
Related topics
Frequently asked questions
What is 3GPP TS 03.91?
3GPP TS 03.91 is the 3GPP Technical Specification for Explicit Call Transfer Supplementary Service. Defines Explicit Call Transfer (ECT) supplementary service for transferring active calls between parties without subscriber participation.
Which 3GPP releases include TS 03.91?
TS 03.91 is published in 3 releases, from R96 to R98. The latest version on 3GPP Explorer is 7.0.0 (R98).
What category does TS 03.91 belong to?
TS 03.91 belongs to the Services (Supplementary Services) category of 3GPP specifications. It applies to 2G networks.
View the full specification with interactive table of contents, version history, and AI analysis.
Read Full Specification →