[Freeswitch-users] Inserting pause on "say" iterated name_spelled?

When using "say" function : <action function="say" data="1234" method="iterated" type="name_spelled"/> I just feel like the spelling between that number a bit fast. Is there a way to insert pause between the number spelled? I supposed can change each number sound file to include silent, but looking for a better way. -Jkwan