IMS version 21.9 > IMS Basics - User Guide > Telephone Number Management (TNM)

Telephone Number Range Type (TNRT) is an essential function that when applied to a range of numbers will determine the way in which those telephone numbers will be used. The IsGeoGraphical and Country components establish the way in which the numbers are configured.

The Country Code is an essential makeup of a telephone number and will be derived from the Country field you chose i.e., UK numbers will inherit the 44-country code, Dubai will be 971, The Netherlands 31, and so on.

The IsGeoGraphical field provides us with up to 4 Code name fields which can be combined in the NameTemplate field to produce a set format naming convention. This is of value for US & Canadian telephone numbers as we will see shortly.

Mobile phone numbers

It is worth pointing out how different countries set up mobile phone numbering plans.

In the USA & Canada, these numbers would be considered geographical since they are prefixed like fixed line numbers with NPA/NXX. In TNM, we make use of the IsGeoGraphical field option of YES.

For other parts of the world, we can select the NO option which gives us one field (Number Code 1) in which we can place the mobile phone number prefix i.e., Netherlands with 6, UK with 7.

Yet in the case of Singapore, where the prefix can be either 8 or 9 (includes pagers until May 2012), the NO option for IsGeographical can still be used, it will be a case of creating two TNRTs, one for the legacy 9 prefixes and another one for the 8 prefixes.

Non geographical numbers

In each country there is a list of non geographical type numbers, the following is an example list:

Freephone

Public sector

Premium business rate

The IsGeoGraphical option of NO can be used with these types of numbers, unless you need to make use of more than one prefix (code field).