I have 5 mailboxes setup. Only 1 is used for receiving messages which is mailbox 0. Mailboxes 1-5 are only used to play an outgoing message. If I call mailbox 0 and leave a message the system will end the call properly in about 30 seconds after the call is ended. On all the other mailboxes, if I end the call before the outgoing message is complete the system takes 5 minutes to hand up. I have adjusted the REcord detect level with little improvement. Are there other hidden settings I can adjust to end the call faster on the mailboxes 1-5?