Try dialing in to the main number and have someone manually transfer you to the voice mail group (I assume 770). See, if you can login as system administrator. If you can, dial 9 for system administration and try a soft reset of the voicemail (dial 989-reset). If you cannot log into the voicemail calling group, have someone transfer you directly to one of the voice mail port extensions. If it answers - that's a good sign. If that fails - chances are the hard drive failed.
Tom Daugirdas,
President
STCG, Inc.
stcg.com