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NBX V3000 Voicemail issues

kollenh
kollenh asked
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Last Modified: 2013-12-27
Background: I inheritied a 3Com NBX V3000 VOIP appliance when I started with this company; at the time, everything worked fine.  A few months ago we switched from DSL to a T1 line that included 6 voice lines.  A contractor was brought in to assist with swapping the physical lines and making sure the voice lines worked properly.  After re-configuring the Line Card Ports, everything seemed to be working fine.

Problem:  Recently several customers reported to my boss that they'd left him a voicemail but he didn't have a notification nor when he logged into his voicemail, was there any in his mailbox.  We did some testing and discovered that if you make a person-person internal call, it works fine; you get to their voicemail, can leave a message, and it shows up.  If you call from an outside line, you will be routed to their voicemail and can leave a message but it doesn't seem to be saved; if the user logs into their voicemail, it will be empty.

I've gone through the Admin documents and all the settings that make sense and I can't find anything to clue me in on what is wrong.  Any help/light/information on the subject would be much appreciated.
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Commented:
Looks like we managed to resolve it ourself.  For other's reference, here is what we found:
An article on 3COM's knowledgebase mentioned that their equipment requires at least a 600 millisecond disconnect signal from the Telco equipment.  I opened a case with our T1 provider and they adjusted the signal from 500ms to 750ms and the problem went away.
Some of the related symptoms that make sense now is the fact that internal transfers worked fine, it was only external calls and that we had 16 instances of going over the 5 minute voicemail limit.
kollenh,
Because you have presented a solution to your own problem which may be helpful to future searches, this question is now PAQed and your points have been refunded.

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