We have call park configured on multiple systems where it works with no problems with 7941 and 7971 phones. The receptionist in some sites is utilizing a 7931 phone. When we push the park button on the 7931 we get a message "there is no mailbox at that extension, goodbye" and the call gets hung up. If park isn't supported on the 7931, it shouldn't show up on the second more screen when on a call. If it is supported, any ideas as to what we have misconfigured?