Ascotel IntelliGate 2025/2045/2065
Part 1 Networking the Systems 77
4.1 Private ISDN-Based Network (PISN)
A private network based on the ISDN standard is referred to as a PISN (Private Inte-
grated Services Network). Its characteristic feature is that all connected subscrib-
ers can communicate with one another in the same way as PBX-internal subscrib-
ers. This applies to both voice traffic and to ISDN-based data traffic. A PISN is the
keystone of any corporate communication structure optimized in terms of flexibil-
ity, user convenience and cost.
A network is generally defined by its nodes and the connections between those
nodes. In a PISN they are formed by ISDN PBXs. A PISN consists of at least two
nodes and can be structured both as a meshed network and as a star-shaped net-
work. Hybrid forms are also admissible.
Usually a PISN is connected to the public network in at least 1 place.
QSIG /
PSS1
QSIG / PSS1 protocol ECMA-standardized signalling protocol used for networking sev-
eral → PINXs. Now standardized worldwide
(ISO / IEC) under the name PSS1 (Private Signalling System 1)
• Parameter value of the "Protocol" trunk group parameter. The
system supports two versions of the QSIG / PSS1 protocol: QSIG
(ETSI, 2nd edition) and QSIG/PSS1 ISO.
TON Type of
number
Parameter used for classifying a call number: Parameter values, if
the call number corresponds to a NPI = E.164: unknown / sub-
scriber / national / international. Parameter values, if the call
number corresponds to a NPI = PNP: unknown / level 0 / level 1 /
level 2
– Transit PINX A PINX acts as a transit PINX for the duration of a connection if it
routes that connection from one PINX to another PINX.
– Source PINX A PINX acts as a source PINX for the duration of a connection if the
connection was set up by one of its subscribers.
– Virtual PBX Network provider offer which comprises a → PNP and various ISDN
supplementary services. Also known under the name → Centrex.
With a virtual PBX the network provider is able to offer his custom-
ers the functionality of a PBX.
– Destination PINX A PINX acts as a destination PINX for the duration of a connection
if the connection’s destination subscriber is one of its subscribers.
Abbr. Term Explanation
To Next Page
Loading...
