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The Global Dialling Scheme (GDS) has been
adopted by a number of European Countries for H.323 interzone
dialling - including Ireland, The Netherlands, Germany,
Switzerland and the UK. More countries are currently being
added to the system.
The plan defines 00 as an international
dialling prefix and the the use of the well-known ITU-T
country telephone codes. Zone prefixes and extension numbers
are defined by the national managing agent - usually the
National Research Network (NRN) in that country.
E.g. To dial a test conference hosted in
the UK, dial 0044 01002 468 where:
- 00 is the international dialling
prefix
- 44 is the code for the UK
- 01002 is the zone in which the MCU
hosting the test conference is registered
- 468 is the conference number
It is also possible to dial existing
ViDeNet numbers through systems connected to the dial plan.
Dial the ViDeNet dial number as if you were connected directly
to a ViDe zone. ViDe numbers usually begin with a single 0.
All other numbers begin with 00.
Note: Within your country system it may
be necessary to dial an additional prefix or 'Exit Zone'
prefix. This is similar to dialling 9 for an outside line from
an internal telephone system. Contact your national gatekeeper
manager for more information.
The WDP uses a hierarchy
of gatekeepers to route call setup information nationally
and internationally. National gatekeepers have knowledge of
all zones within a country, World gatekeepers have knowledge
of all National gatekeepers.
Where a country does not have a National
Gatekeeper and an institution within that country would like
to join the system, it will be possible for another National
Gatekeeper to act as a 'Virtual Gatekeeper' until that country
has its own Gatekeeper in place. This means that the
institution can have a number within its own country code from
the beginning.
If you would like further information on
connecting to the system please contact:
Egon
Verharen at Surfnet
Victor Reijs at HEAnet
John Martin at the
JVCS Management Centre, University of Edinburgh
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