Private Integrated Services Network (PISN)
- Mapping Functions for the Tunnelling of QSIG through H.323 Networks
2nd edition (December 2003)
This Standard specifies functions for using an H.323 packet
network in order to interconnect two Private Integrated services
Network eXchanges (PINXs) forming part of a Private Integrated
Services Network (PISN). Interconnection is achieved by carrying
the inter-PINX signalling protocol over the H.323 call signalling
channel, making use of the protocol tunnelling facilities of H.323,
and inter-PINX user information (e.g., voice) over logical channels
established through H.323. Each logical channel usually represents
a unidirectional media stream conveyed by means of the Real-time
Transport Protocol (RTP). The inter-PINX signalling protocol is
assumed to be QSIG, as specified in ECMA-143,
ECMA-165 and other standards.
The Standard provides for an on-demand type of interconnection,
where a separate H.323 call is established at the start of each
PISN call and cleared down at the end of that call. A semi-permanent
scenario where a single H.323 call with an indefinite lifetime
carries QSIG on behalf of many PISN calls is described as an additional
In the scenarios covered in this Standard, the PINXs participating
in a call are not necessarily aware of the H.323 network providing
the interconnection, and the features available are those of the
QSIG network. This is different from a scenario where true interworking
between QSIG and H.323 (i.e. QSIG-H.323-QSIG) is used to connect
two PISNs or two parts of the same PISN. In this latter case all
networks participate in a call on equal terms, and features are
limited to those available in all networks and supported by the
gateways. This latter scenario is outside the scope of this Standard.
This Standard is applicable to PINXs that can be interconnected
to form a PISN using QSIG as the inter-PINX signalling protocol.
The following file can be freely downloaded:
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 23290.
The previous replaced "historical" edition of this Ecma Standard is available here.