On Wed, 15 Sept 2021 at 06:38, Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> wrote:
Shane Ronan wrote:

> But in fact with local number portability, you cannot rely on the county
> code to tell you where to route a telephone call anymore.

Not. With geographical aggregation, you may route a call
*anywhere* in the destination country.

You mean anywhere in the world. Calls to my number reach my cell phone no matter where I go. 
 

Number portability database is looked up after the call
reaches the destination country, which will be used for
further intra-national routing, which do not affect
country-wise aggregation of international routing table.


Actually the GSM system will query the HLR to find out where to really route the call. Much like LISP actually.

Regards,

Baldur