Solution proposal for the tldn conflict in the international call delivery
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Solution proposal for the TLDN conflict in the international call delivery. IFAST-14 Lima, Perú October 4-5, 2000. The TLDN conflict.

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Solution proposal for the TLDN conflict in the international call delivery

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Solution proposal for the tldn conflict in the international call delivery

Solution proposal for the TLDN conflict in the international call delivery

IFAST-14

Lima, Perú

October 4-5, 2000


The tldn conflict

The TLDN conflict

  • The TLDN conflict appears in the international call delivery scenario when there is an exchange of a 10 digit temporal local directory number (TLDN) between two countries with different numbering plans.


Ex 1 a chicago user roams to mexico city current status

Ex. 1: A Chicago user roams to Mexico City(current status)

Chicago MIN:

312-224-1234

5.- The Chicago switch

adds the international

prefix to deliver the call

because the TLDN begins

with 52X

2.- The Chicago switch sends a

ROUTREQ (312-224-1234)

3.- The Mexico switch

allocates a 10 digit

TLDN in the range

52-5101-5200

Û

52-5101-5299

Switch

Chicago

4.- The Mexico switch returns a

routreq (TLDN = 52-5101-5212)

Switch

Mexico

6.- The Chicago switch

makes the international call

011-52-5101-5212

7.- The PSTN delivers

the call to the Mexico switch

PSTN

1. A Chicago user

calls the roamer


Solution proposal for the tldn conflict in the international call delivery

Ex. 2: A Chicago user roams to Mexico City(assume a new NPA 525 assigned in New York)

Chicago MIN:

312-224-1234

5.- The Chicago switch does

not know if the TLDN is from

Mexico or New York and can

fail the call delivery

2.- The Chicago switch sends a

ROUTREQ (312-224-1234)

3.- The Mexico switch

allocates a 10 digit

TLDN in the range

52-5101-5200

Û

52-5101-5299

Switch

Chicago

4.- The Mexico switch returns a

routreq (TLDN = 52-5101-5212)

Switch

Mexico

6.- The Chicago switch makes

the call: 1-525-101-5212

PSTN

1. A Chicago user

calls the roamer

7.- The PSTN delivers th call

to thewrong destiny 525-101-5212

in New York

Switch

New York


Solution proposal for the tldn conflict in the international call delivery

Ex. 3: A Chicago user roams to Mexico City(Mexico increases the natl. number from 8 to 10 digits)

Chicago MIN:

312-224-1234

5.- The Chicago switch does

not know if the TLDN is from

Mexico or a North America

city with NPA 555

2.- The Chicago switch sends a

ROUTREQ (312-224-1234)

3.- The Mexico switch

allocates a 10 digit

TLDN in the range

52-55-5101-5200

Û

52-55-5101-5299

Switch

Chicago

4.- The Mexico switch can return a

routreq (TLDN = 55-5101-5212)

Switch

Mexico

6.- The Chicago switch makes

the call: 1-555-101-5212

PSTN

1. A Chicago user

calls the roamer

7.- The PSTN delivers th call

to the wrong destiny 555-101-5212

in a North America city with NPA 555

Switch

USA


Solution proposal for the tldn conflict in the international call delivery

Alternative #1 to handle the TLDN conflict

  • The visited switch could send the IRM in the TLDN field and the home switch would have to translate the IRM to a real directory number of the country that sends the TLDN.

  • The drawback of this alternative is that the switch would have to store translation tables of IRM’s of all the countries with roaming agreements.


Solution proposal for the tldn conflict in the international call delivery

Alternative #1: A Chicago user roams to Mexico City and translation tables are used to deliver the call

Chicago MIN:

312-224-1234

5.- The Chicago switch

analyzes the first 6 digits of

the TLDN and determines

through tables that this number

is from Mexico City and have

to be routed to the actual

DN in Mexico City:

52-55-5101-5212

2.- The Chicago switch sends a

ROUTREQ (312-224-1234)

3.- The Mexico switch

sends the IRM of one

actual TLDN, say

52-55-5101-5212

Switch

Chicago

4.- The Mexico switch returns a

routreq (TLDN = 059501-5212)

Switch

Mexico

6.- The Chicago switch

makes the international call

011-52-55-5101-5212

7.- The PSTN delivers

the call to the Mexico switch

PSTN

1. A Chicago user

calls the roamer


Solution proposal for the tldn conflict in the international call delivery

Alternative #2 to solve the TLDN conflict

  • The switches would have to handle the international option in the field “nature of the number” of the parameter “digits” of IS-41C to determine if a TLDN is coming from another country.

  • Additionally, to manageTLDN’s of lengh different from 10, the parameter “digits” of IS-41C has to be activated to variable lenght up to 15 digits, as allowed in IS-41C.


Solution proposal for the tldn conflict in the international call delivery

Alternative #2: A Chicago user roams to Mexico City and the proper parameters of IS-41C are used

Chicago MIN:

312-224-1234

5.- The Chicago switch

identifies the international

nature of the number and can

handle the 12 digits lenght of

the TLDN

2.- The Chicago switch sends a

ROUTREQ (312-224-1234)

3.- The Mexico switch

sends a 12 digits TLDN

in the range

52-55-5101-5200

Û

52-55-5101-5299

Switch

Chicago

4.- The Mexico switch returns routreq

(digits destination=52-55-5101-5212,

nature of number=international)

Switch

Mexico

6.- The Chicago switch

makes the international call

011-52-55-5101-5212

7.- The PSTN delivers

the call to the Mexico switch

PSTN

1. A Chicago user

calls the roamer


Solution proposal for the tldn conflict in the international call delivery

Conclusions

  • The TLDN conflict has been avoided through provisional solutions but in general, these schemes do not work because the differences in the numbering plan of the countries.

  • The TLDN conflict is specially relevant in those countries with national numbers of length different of 10 digits.


Solution proposal for the tldn conflict in the international call delivery

Conclusions (cont.)

  • The first alternative proposed to handle the conflict is to use translation tables to relate IRM’s to TLDN’s. However, this alternative can be complex to implement.

  • The second alternative is activating the proper fields of IS-41C in the mobile systems to accept international and variable length TLDN’s. This is the best solution but implies a certain cost and a strong cooperation of industry to implement this solution internationally.


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