Category: 31 Test of supplementary services
- 31.13 Explicit Call Transfer (ECT)
- 31.14 User-to-User Signalling (UUS)
- 31.15 Follow Me (FM)
- 31.6 Charging supplementary services
- 31.7 Additional information transfer supplementary services
- 31.8 Call restriction supplementary services
- 31.9 Handling of undefined (future) GSM supplementary services
- 31.10 MMI input for USSD
- 31.11 Specific message contents and ASN.1 codings
- 31.12 eMLPP Service