glpi 11 already has an association of telephones with lines
Unfortunately, it is not yet possible to obtain a list of telephone data + associated line in the results of a query.

hi @curtis Conard  Thanks for adding this to GLPI 11. Is it possible to add the line columns to the phone list? Or vice versa (in the line list... add columns of phone data)

issue related: https://github.com/glpi-project/glpi/issues/22052