ETS 300 650 : 20001

Foreword
1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Description
6 Procedures
  6.1 Provision and withdrawal
  6.2 Normal procedures
  6.3 Exceptional procedures
7 Intercommunication considerations
  7.1 Interworking with non-ISDNs
  7.2 Interworking with private ISDNs
8 Interaction with other supplementary services
  8.1 Advice of charge services
  8.2 Call waiting
  8.3 Call hold
  8.4 Explicit call transfer
  8.5 Number identification services
  8.6 Closed user group
  8.7 Call completion services
  8.8 Conference services
  8.9 Direct dialling in
  8.10 Diversion services
  8.11 Freephone
  8.12 Malicious call identification
  8.13 Multiple subscriber number
  8.14 Subaddressing
  8.15 Terminal portability
  8.16 Three party
  8.17 User-to-user signalling
  8.18 In-call modification
  8.19 Hunting services
  8.20 Support of private numbering plans
  8.21 Outgoing call barring
  8.22 MWI
  8.23 Remote control
  8.24 Universal access number
  8.25 Card calling services
  8.26 Premium rate
  8.27 Televoting
  8.28 Universal personal telecommunications
History

The message waiting indication is a supplementary service to support (voice) mail systems. The MWI supplementary service gives the possibility to give an indication that (voice) mail is available to the intended recipient.