Simplified solution for the TLDN conflictin the international call delivery

IFAST-16

Ixtapa, México

May 15-16, 2001

Proposed solution to the TLDN conflictProposed 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.

Simplified solution for networks without IS-41DSimplified 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.

Mexico MIN:52-5500-2186

SwitchArgentina

SwitchMexico

PSTN

6.- The PSTNdelivers the call tothe Argentina switch1. A wireline Mexican user

calls the Mexican roamer

Practical implementation of the simplified solutionPractical implementation of the simplified solution

3.- The Argentina switch returns

a regular TLDN of 10 digits

routreq (384-448-7800)

GWGTE-TSI

4.- GTE-TSI adds th

e prefix 00

and the resulting TLDN is

of 12 digits

routreq (00-384-448-7800)

2.- The Mexico switch sends aROUTREQ (52-5500-2186)

5.- The Mexico switch can receive the 12 digits.By prefix analysis, determines that is an international number from Argentina, adds the international prefix 54and routes the number 00-54-384-448-7800 to the PSTN

Mexico MIN:312-224-1234

SwitchMexico

SwitchChicago

PSTN7.- The PSTNdelivers the call tothe Mexico switch

1. A wireline user from Chicago calls the roamer

4.- The Mexico switch returns

a 15 digits TLDN

routreq (011-52-55- 5101-5212)

STPsNACN

5.- The messa

ge routreq is

not modifie

d by NACN

routreq (011-52-55- 5

101-5212)

2.- The Chicago switch sends aROUTREQ (312-224-1234)

6.- The Chicago switch is able toreceive 15 digits of the TLDN andonly analyzing the prefix, routes directlythe call to the PSTN

3.- The switch is alreadyprepared to send morethan 10 digits in theTLDN field

Simplified solution for 10 digits inSimplified solution for 10 digits inthe national number of Mexicothe national number of Mexico

ConclusionConclusion

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.