Many large countries in turn have internal rules on how and where specific subsets of their callsigns can be used (such as Mexico's XE for AM and XH for FM radio and television broadcasting), which are not covered here.
Banyak negara besar mempunyai peraturan internal mengenai bagaimana dan di mana subset spesifik dari tanda panggil mereka digunakan (seperi di Meksiko, XE digunakan untuk radio AM dan XH digunakan untuk radio FM dan siaran televisi), yang tidak dijelaskan di sini.