I have the messaging module installed in slot #4. When callers call in they hear a pause and then: "your call is being transferred" and calls transfer to ext 10 (as programmed). I am trying to program the system, how would I to "turn off" the messaging until programming is complete so that all calls ring as if there is no messaging system installed or change the number of rings before that message plays? This is a used module and I cannot access any mailboxes, can I delete or reset them? I do have the general messaging pw. Also, is an install and programming guide available online?