It's not a one-size fits all. Because all Permit-Required Confined Spaces are not the same, training is specific to the space in question. See 29 CFR 1910.146(c), and .146(c)(8) and (9) in particular.
Check
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9797
The employer must determine if any spaces are permit-required confined spaces, and, if employees will enter such spaces, must develop a permit space program. "When an employer (host employer) arranges to have employees of another employer (contractor) perform work that involves permit space entry, the host employer shall: Inform the contractor... that permit space entry is allowed only through compliance with a permit space program...apprise the contractor of the...hazards...apprise the contractor of any precautions or procedures that the host employer has implemented..."
In short, if your employees will enter permit required confined spaces, it's up to you to develop and implement a program and to train entrants, attendants and supervisors and to select a rescue team. If your employees are entering someone else's permit-required confined space, you have to work with the host employer on entry procedures and training.
Be mindful that lots of employers have erroneously posted some simple confined spaces as permit-required confined spaces, or have posted the spaces but not developed entry plans.