Avaya IP Office V8.1 Not greeting callers

Avaya IP Office 500 switch/hub going into a patch panel. - All seems OK

Running Avaya  IP Office 8.1 Manager on the PC. Our phone system is no longer greeting callers. It just rings and rings and rings.
I'm able to ping the gateway and static ip. Everything was working up until a few days ago apparently.

I tried rebooting the Avaya and also the IP Office 500 Switch.

Any ideas or direction is greatly appreciated.

TY All...
Joel BudITAsked:
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Joel BudITAuthor Commented:
The VM feature is not running. VM Pro. Any phone I goto i select voicemail and it's basically not available, it's causing the greeting to not work also when people call in.

From what I can tell no ip's changed, internally or externally. They user are still able to call in and out. I have to do some research but curious if anyone has any pointers or ideas.
Joel BudITAuthor Commented:
"Voicemail Pro connection failure"

Last Date Of Error   Occurrences  Error Description                            
   4/4/2018 4:55:02 PM  3            The following system resources are all in use:
                                     Voicemail Channels
Joel BudITAuthor Commented:
Solved services.msc turn on VMPro.

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