Corporate Telecommunication Networks
- Signalling Interworking between QSIG and SIP - Basic Services
2nd edition (December 2006)
This Standard specifies signalling interworking between "QSIG"
and the Session Initiation Protocol (SIP) in support of basic
services within a corporate telecommunication network (CN).
"QSIG" is a signalling protocol that operates between Private
Integrated Services eXchanges (PINX) within a Private Integrated
Services Network (PISN). A PISN provides circuit-switched basic
services and supplementary services to its users. QSIG is specified
in other Ecma Standards, in particular ECMA-143
(call control in support of basic services), ECMA-165
(generic functional protocol for the support of supplementary
services) and a number of Standards specifying individual supplementary
SIP is an application layer protocol for establishing, terminating
and modifying multimedia sessions. It is typically carried over
the Internet Protocol (IP) (IETF RFC 791 and IETF RFC 2460). Telephone
calls are considered as a type of multimedia session where just
audio is exchanged. SIP is defined in IETF RFC 3261.
This Standard specifies signalling interworking for basic services
that provide a bi-directional transfer capability for speech,
DTMF, facsimile and modem media between a PISN employing QSIG
and a corporate IP network employing SIP. Call-related and call-independent
signalling in support of supplementary services is outside the
scope of this Standard, but support for certain supplementary
services (e.g., call transfer, call diversion) could be the subject
of future work.
Interworking between QSIG and SIP permits a call originating
at a user of a PISN to terminate at a user of a corporate IP network,
or a call originating at a user of a corporate IP network to terminate
at a user of a PISN.
Interworking between a PISN employing QSIG and a public IP network
employing SIP is outside the scope of this Standard. However,
the functionality specified in this Standard is in principle applicable
to such a scenario when deployed in conjunction with other relevant
functionality (e.g., number translation, security functions, etc.).
This standard is applicable to any interworking unit that can
act as a gateway between a PISN employing QSIG and a corporate
IP network employing SIP.
The following file can be freely downloaded:
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 17343.
The previous replaced "historical" edition of this Ecma Standard is available here.