1.a) NGN emulation scenarion with the replacement of Class5 exchanges in PSTN/ISDN networks
In this scenario, transit exchanges are replaced with trank gateways at the border of transport IP network and PSTN/ISDN networks, and with call servers (Softswitches or IMS Core platforms) that represent in NGN Core PSTN/ISDN Emulation Subsystem. Eligable call servers, that are candidates for interoperability test should provide ISUP-based call model, interworking between SSN7 BICC/ISUP signalling interface and IP-based SIP Profile C (SIP-I) signalling interface. Bearer control protocol between media gateway controller (MGC), as a part of a call server, and trunk gateway is H.248 (MEGACO) Profile for trunk gateways. Call server should interoperate with other call server in another NGN domain by means of SIP Profile C (SIP-I) protocol as network to network (NNI) interface.
1.b) NGN emulation scenarion with the replacement of Class4 and Class5 exchanges in PSTN/ISDN networks
In this scenario, transit exchanges are replaced with call servers (Softswitches or IMS Core platforms) that represents NGN Core PSTN/ISDN Emulation Subsystem, while the local exchanges are replaced with the ISDN and PSTN access (AGW) or/and residential (RGW) gateways. Local Eligable call servers, that are candidates for interoperability test should provide ISUP-based call model, interworking between IUA (ISDN user adapter) signalling interface for ISDN based calls and IP-based SIP Profile C (SIP-I) signalling interface. Bearer control protocol between media gateway controller (MGC), as a part of a call server, and trunk gateway is H.248 (MEGACO) for AGW and RGW. Call server should interoperate with other call server in another NGN domain by means of SIP Profile C (SIP-I) protocol as network to network (NNI) interface.
Physical network architecture for both scenarios is shown in Figure bellow.
2) Interworking between NGN Core and PSTN/ISDN networks
The network configuration for this scenario is shown in figure bellow. The scenario is similar to the scenario 1.b) with the distinction, that calls are terminated at VoIP SIP-based telephones. The emphasis on end-to-end testing is focused on interoperability of supplementary services (which services can be supported in such scenario) and interworking between ISUP based call control (SIP-I) and SIP-based call control.
Relevant Standards
Detailed technical programme for NGN scenarios with the scope definition for end-to-end network integration test will be provided in a “downloadable file” . A list of most relevant ESTI TISPAN NGN standards is given in a table bellow:
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Base standards: |
DTR/TISPAN-01016-NGN
DES/TISPAN-02007-NGN
DEN/TISPAN-03008-eNGN
DES/TISPAN-03009-eNGN
DTS/TISPAN-03011-eNGN
...
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NGN Release 1; Release definition
Functional architecture for NGN
Interworking for SIP/SIP-T (BICC, ISUP)
H.248 profile for gateways to ensure PSTN/ISDNservice continuity
IUA (Endorsement of RFC 3057)
... |
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TISPAN Test specifications: |
DTS/TISPAN-06014-1-Tech
DTS/TISPAN-06014-2-Tech
DTS/TISPAN-06014-3-Tech
DTS/TISPAN-06014-4-Tech
RTS/TISPAN-06015-1-Tech
DTS/TISPAN-06016-NGN
DTS/TISPAN-06017-NGN
DTR/TISPAN-06018-NGN
DTS/TISPAN-06019-1-NGN
DTS/TISPAN-06020-1-NGN
DTS/TISPAN-06021-1-NGN
DTS/TISPAN-06022-Tech
DTS/TISPAN-06012-NGN |
Interworking between SIP and BICC or ISUP Profile A and B;
Part 1: TSS & TP
SIP-BICC/ISUP
Interworking between SIP and BICC or ISUP Profile C;
Part 2: TSS&TP
SIP-BICC/ISUP
Interworking between SIP and BICC or ISUP Profile A and B;
Part 3: ATS & PIXIT
SIP-BICC/ISUP
Interworking between SIP and BICC or ISUP Profile C;
Part 4: ATS & PIXIT
SIP-BICC/ISUP
Network Integration testing between H.323, ISDN and PSTN;
Part 1: Test Suite Structure and Test purposes (TSS&TP)
NIT H.323
Technology Compliance Specifications; IETF RFC3325; TSS&TP
Interworking between SIP and BICC or ISUP;
Part 1: PICS
SIP/ISUP PICS
Testing SIGTRAN protocols
Testing SIGTRAN
Terminating Identification Presentation (TIP) and Terminating Identification Restriction (TIR )
Part 1: Test Suite Structure and Test Purposes (TSS&TP)
TIP/TIR TSS&TP
Originating Identification Presentation (OIP) and Originating Identification Restriction (OIR)
Part 1: Test Suite Structure and Test Purposes (TSS&TP)
OIP/OIR TSS&TP
Communication HOLD (CH);
Prt 1: Test Suite Structure and Test Purposes (TSS&TP)
HOLD TSS1TP
Network Performance objectives tests for IP-based Voice services
QoS performance test
Network Integration Testing between SIP and ISDN/PSTN network signaling protocols |
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