ECMA/TR 91 : 1ED 2005

1 Scope
2 References
3 Definitions
  3.1 Corporate telecommunication Network (CN) [2]
  3.2 Next Generation CN (NGCN)
  3.3 Next Generation Network (NGN)
  3.4 Virtual Private Network (VPN) [1]
  3.5 Application Service Provider (ASP)
  3.6 Session Service Provider (SSP)
  3.7 Transport Service Provider (TSP)
4 Abbreviations
5 Background
  5.1 Provision of services by NGNs
  5.2 Management considerations
6 Basic Configurations and General Requirements
  6.1 Scenario 1 - Communication between NGCNs via
      an NGN using a VPN
  6.2 Scenario 2 - Communication between NGCNs via
      an NGN not using a VPN
  6.3 Scenario 3 - Communication between NGCN and TE
      via an NGN using a VPN
  6.4 Scenario 4 - Communication between NGCN and TE
      via an NGN not using a VPN
  6.5 Scenario 5 - Communication between NGCN and
      PSTN/ISDN via an NGN
  6.6 General requirements on NGNs
  6.7 General requirements on NGNs concerning measures
      for compliance with regulations
7 Technical issues and requirements on NGN related to
  session service provision
  7.1 Signalling architecture
  7.2 NAT traversal
  7.3 Firewall traversal
  7.4 Identification
  7.5 Provision of identification information
  7.6 Security
  7.7 Session policy
  7.8 Emergency calls
  7.9 Geographic location

Recognizes key use cases for communication with or between IP-based Next Generation Corporate Networks (NGCN) involving public next generation networks (NGN), analyses these use cases in terms of available or planned standardised technology and identifies requirements that will have to be met.