This article assumes you know how to create a restriction profile.
To enable dictation on a device you should have the following 2 options checked in a restriction profile;
- Allow Dictation
- Allow Siri
- Allow Siri while locked
Dictation will not work if either restriction is unchecked.
Enabling dictation on the device:
By going to Settings > General > Keyboard and Enabling Dictation you should get a microphone button on your devices' keyboard:
When you press this button you'll be able to dictate on the iPad.