Sin t

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Destination Point Codes Assignement
IFAST-14 Lima, Perú October 4-5, 2000
Telefónica Móviles S. A. U. October 2000
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Current situation

• There are two overlapping signalling networks
• ITU Standard for voice traffic.
• ANSI Standard for Roaming Call delivery.

This is an undesired situation, due to the
interstandard IS 41, generally adopted in
non-GSM networks, is an ANSI development
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Destination Point Codes (DPCs)

• ANSI and ITU signalling Networks use different
  DPCs numbering plan.
• While ITU DPCs are assigned internationally and
  are widely used in voice traffic, ANSI DPCs are
  supposed to be used internally in the United
  States.
• The fact is that ANSI DPCs are the only way to
  establish roaming between IS-41 Signalling
  Networks.

Non GSM Cellular Operators are compelled to use
ANSI codes for roaming
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Destination Point Codes (DPCs)
This configuration requires a mapping between
ANSI and ITU DPCs
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Destination Point Codes (DPCs)
6
Destination Point Codes (DPCs)
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ANSI DPCs Assigment

• ANSI Comitee is responsible for this assigment
  (T1S1)
• Telcordia performs the assigment under a set of
  rules that do not consider the use of the DPCs
  outside of USA.

The assigment procedure can only be modified by
ANSI Comitee.
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How DPCs are being used Outside the U.S.?
A U.S. Signalling Carrier, that has a DPCs
range assigned, uses part of its codes for
addressing Southamerican, and Asian
Operators. or The signalling Carrier performs a
translation between ANSI DPCs and International
ITU codes.
In both situations, Operators dont have their
own DPCs, which are really assigned to the
signalling Carriers
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Whats wrong with this situation?

• DPCs must be set up in all networks which have
  roaming agreements.
• Up to now, roaming business was not very
  developed, and only a limited number of roamig
  agreements were established.
• An eventual change of DPC is an important task
  that must be performed in all networks at the
  same time. With the growth of roaming agreements,
  such a change will become a really difficult task.

If operators dont own their DPCs, they are
constrained to modify such key parameters if they
want to change to a different signalling Carrier
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Conclusions

• A key parameter like DPCs, cannot be out of the
  control of the Operators.
• The current situation is an obstacle for the
  opening of the market, making competition
  difficult which is a driving factor for the
  industry and operators.
• There should be a change in ANSI directives in
  order to provide South American Cellular
  Operators with DPCs for roaming purposes.
• This will facilitate the growth of roaming
  agreements, with a direct effect on Carriers
  profits.