TCAP primitives are sent between the application and the local TCAP stack, all TCAP messages are primitives but there are primitives that are not messages, i.e. some are only transferred inside the local machine.
TCAP primitives are sent between the application and the local TCAP stack, all TCAP messages are primitives. There are primitives. These primitives are not messages. These primitives were i.e. some are only transferred inside the local machine.