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Simplified solution for the TLDN conflict in the international call delivery

Simplified solution for the TLDN conflict in the international call delivery. IFAST-16 Ixtapa, México May 15-16, 2001. Proposed solution to the TLDN conflict. Activate TLDN’s in the parameter “digits” to variable lenght up to 15 digits, as allowed in all the versions of IS-41.

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Simplified solution for the TLDN conflict in the international call delivery

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  1. Simplified solution for the TLDN conflictin the international call delivery IFAST-16 Ixtapa, México May 15-16, 2001

  2. Proposed solution to the TLDN conflict • Activate TLDN’s in the parameter “digits” to variable lenght up to 15 digits, as allowed in all the versions of IS-41. • Additionally, to activate the international option in the field “nature of the number” of the parameter “digits” of IS-41D to determine if a TLDN is coming from a foreign country.

  3. Simplified solution for networks without IS-41D • Activate TLDNs in the parameter “digits” to variable lenght up to 15 digits, as allowed in all the versions of IS-41. • Perform a prefix analysis to determine if the TLDN is international.

  4. Practical implementation of the simplified solution Mexico MIN: 52-5500-2186 GW GTE-TSI 4.- GTE-TSI adds the prefix 00 and the resulting TLDN is of 12 digits routreq (00-384-448-7800) 3.- The Argentina switch returns a regular TLDN of 10 digits routreq (384-448-7800) 2.- The Mexico switch sends a ROUTREQ (52-5500-2186) Switch Argentina Switch Mexico 5.- The Mexico switch can receive the 12 digits. By prefix analysis, determines that is an international number from Argentina, adds the international prefix 54 and routes the number 00-54-384-448-7800 to the PSTN 6.- The PSTN delivers the call to the Argentina switch 1. A wireline Mexican user calls the Mexican roamer PSTN

  5. Simplified solution for 10 digits inthe national number of Mexico Mexico MIN: 312-224-1234 STPs NACN 5.- The message routreq is not modified by NACN routreq (011-52-55- 5101-5212) 4.- The Mexico switch returns a 15 digits TLDN routreq (011-52-55- 5101-5212) 2.- The Chicago switch sends a ROUTREQ (312-224-1234) Switch Mexico Switch Chicago 6.- The Chicago switch is able to receive 15 digits of the TLDN and only analyzing the prefix, routes directly the call to the PSTN 3.- The switch is already prepared to send more than 10 digits in the TLDN field 1. A wireline user from Chicago calls the roamer PSTN 7.- The PSTN delivers the call to the Mexico switch

  6. Conclusion • Many of the roaming partners have older versions of IS-41 and while they do not implement the newer revision D, the simplified solution can be implemented just to keep the international roaming with these partners.

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