At this point kick off the batch file(s) and go to the after footprinting section. There will not be much in here aside from some general considerations.
White-hats. Definitely find out best times to dial and whether or not there are any other unique situations to consider. Your goal is to not disrupt the organization. Most companies will not have a PBX IDS (hehehe) so you should fly on by without much notice.
GOOD LUCK!