Have a partner ACS 308 R3 w/ Voice messaging. Customer says phone rings intermittently throughout day and no one is on the other end. havent been out there yet to troubleshoot, dont know if it is just one phone or a phone line or intercom path. Going to tell customer to look at display when call comes in. Any suggestions with this limited info? Dont think any messages are left from these calls or hang ups.

Best to get the specific symptoms and post them here.

Unless they can make it happen while you are there you won't find out anything and even then probably not. You can't rely on anything the customer tells you either. This is the kind of thing where you start replacing modules one at a time, go away and wait for them to tell you the problem is still happening or it stopped.

-Hal

Try doing a system restart / reboot.

If it's only one set, maybe it got set somehow as the fax manager extension.
Was there ever a fax on the system?
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MrG

Not sure if there was a fax on system. This system was left over from previous customer.
Had not been used for many mos., maybe over a year. The phone we know it has been ringing on is ext. 10. Well know more when we go back there next week.

Does the Auto Attendant answer first? I would suspect lack of reliable disconnect, and callers hanging up on the auto attendant

No, owner can pick up phone before auto attendant answers, and no one is on other end.