User`s guide

24(59)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
99-07-15 A
365/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
Supplementary service -
User-to-User Signalling
Definition
In ASB 150 02, the request of the ISDN supplementary
service UUS is supported at the T- interface. At the Q-
interface it is used as a proprietary service.
The UUS supplementary service enables a user (A
user within a CN can be a subscriber and/ or a PBX
in this context a PBX is meant) to send/receive a
limited amount of information to/from another user via
the signalling (D) channel in association with a call to
the other user. This information is passed
transparently through the network.
Use
The UUS supplementary service is used to transfer
proprietary UUI (=User-to-User Information),
according to the ASB 501 unique protocol via the
public ISDN (VPN) or via a private QSIG network, to
support additional CN (=Corporate Network) features
and services between ASB 150 02 and
ASB 150 02 / ASB 501.
UUS will not be used at non-proprietary CN calls
(=Call between CN users, where no proprietary
services are supported).
Operation
There are three different UUS supplementary services:
• Service 1: User-to-User Information (UUI) can
be sent and received during the setup
and clearing phase of a call within call
control messages.
• Service 2: User-to-User Information (UUI) can
be sent and received during the alerting
phase of a call within USER
INFORMATION messages.
• Service 3: User-to-User Information (UUI) can
be sent and received during the active
phase of a call within USER
INFORMATION messages.
For a proprietary call, UUS 1 must always be
subscribed. The availability of UUS 2 and / or UUS 3
increases the number and functionality of services that
can be offered.
Limitations
At the Q-reference point with leased lines between the
private network nodes (PBXs) the proprietary services
UUS 1, 2, 3 can always be used.
However, at the T-reference point, the support of UUS
1, 2, 3, which is dependent on the public ISDN,
impacts availability of the proprietary CN services
mentioned on the next page.
The following table shows support of UUS 1, 2, 3 in
European markets (according to information by
network operators, in the beginning of 1998)