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Global Dialling Scheme 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 scheme defines 00 as an
international dialling prefix and 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 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 Global Dialling Scheme uses a hierarchy
of gatekeepers to route call set-up 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
Steve Williams Welsh Video Network
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