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Destination Point Codes Assignement
Telefónica Móviles S. A. U.October 2000
IFAST-14
Lima, Perú
October 4-5, 2000
Telefónica Móviles S. A. U.
There are two overlapping signalling networks:
• ITU Standard for voice traffic.
• ANSI Standard for Roaming Call delivery.
Current situation
This is an undesired situation, due to the interstandard IS –41, generally adopted in non-GSM networks, is an
ANSI development
Telefónica Móviles S. A. U.
Destination Point Codes (DPC’s)
• ANSI and ITU signalling Networks use different DPC’s numbering plan.
• While ITU DPC’s are assigned internationally and are widely used in voice traffic, ANSI DPC’s are supposed to be used internally in the United States.
• The fact is that ANSI DPC’s are the only way to establish roaming between IS-41 Signalling Networks.
Non GSM Cellular Operators are compelled to use ANSI codes for roaming
Telefónica Móviles S. A. U.
Destination Point Codes (DPC’s)
IS-41 MAPON ANSI TCAP
ANSI SCCP/MTP
IS-41 MAPON ANSI TCAP
ANSISCCP/MTP
ITU-TSCCP/MTP
ITU-TSCCP/MTP
application data exchange
GATEWAY STP
This configuration requires a mapping between ANSI and ITU DPC’s
Telefónica Móviles S. A. U.
Destination Point Codes (DPC’s)
IS-41 MAPON ANSI TCAP
ANSI SCCP/MTP
IS-41 MAPON ANSI TCAP
ANSISCCP/MTP
ITU-TSCCP/MTP
ITU-TSCCP/MTP
GATEWAY STP
ANSI COUNTRY NON ANSI COUNTRY
• ITU-T PC
• ANSI PC
ITU-T PC
Telefónica Móviles S. A. U.
Destination Point Codes (DPC’s)
IS-41 MAP
ON ANSI TCAP
ANSI
SCCP/MTP
IS-41 MAP
ON ANSI TCAP
ANSI
SCCP/MTP
ITU-T
SCCP/MTP
ITU-T
SCCP/MTP
GATEWAY STP
ANSI COUNTRY NON ANSI COUNTRY
• ANSI PC • ANSI PC
• ITU-T PC
Telefónica Móviles S. A. U.
ANSI DPC´s 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 DPC’s outside of USA.The assigment procedure can only be
modified by ANSI Comitee.
Telefónica Móviles S. A. U.
How DPC’s are being used Outside the U.S.?
A U.S. Signalling Carrier, that has a DPC’s range assigned, uses part of its codes for addressing Southamerican, and Asian Operators.
orThe signalling Carrier performs a translation between ANSI DPC’s and International ITU codes.
In both situations, Operators don’t have their own DPC’s, which are really assigned to the
signalling Carriers
Telefónica Móviles S. A. U.
What’s wrong with this situation?• DPC’s 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 don’t own their DPC’s, they are constrained to modify such key parameters if they
want to change to a different signalling Carrier
Telefónica Móviles S. A. U.
Conclusions
• A key parameter like DPC’s, 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
DPC’s for roaming purposes.
This will facilitate the growth of roaming agreements, with a direct effect on Carriers profits.
