For sending a fax,

I'm thinking a simple off-hook, hot line dialing of 702 with a timer of 0 for your fax's ext (216)
This would always connect your fax with that outside line when it picks up the line to dial. This would relieve the need to begin an outgoing fax call with a 9.

If the line 2 is busy the fax would recieve a busy signal.

I'm not sure of the procedure of the setup on the OfficeServ 100. Its an MMC of its own in the Customer Level programming.