We use Message Manager for our Intuity/Audix system (rel 5.2, I think) that we'll be retiring soon when we go to Modular Messaging. At that time, we'll be converting our fax users to new RightFax numbers. I am really looking forward to that, although I have been pretty happy with Intuity/Audix and Message Manager all along.
I've found that Intuity usually manages to accept faxes of up to 3 pages with average density. But if the faxes are very dense (edge-to-edge photos) or >3 pages of text, they don't come through so well. Worse, the senders will often get a "fax transmission successful" message and think all is well!
When I add a fax number to an Intuity voicemailbox, I make sure to tell the user that this is a "personal" fax designed for 3 pages or fewer; faxing needs greater than that should go to a physical machine.
I have occasionally conveyed a couple of the following self-construed thoughts/theories to our users who seemed accepting of them. It's the best I could do, since Avaya would consistently tell me nothing was wrong even when we had evidence to prove otherwise. I gave up contacting Avaya about the failed faxes. Whether these points are valid or not, I leave to your judgment:
1. It's an old system.
2. The transmission rate is slow.
3. During transmission, the slightest hiccup can make the whole thing fail. The slower the transmission, the greater the chance for a failure.
4. Voicemail ports are generally used for 30-60 seconds for incoming messages, rarely greater than 180 seconds for message retrieval. Faxes often take more than 60 seconds PER PAGE, depending on density. The longer the duration of a fax, the more likely a hiccup.
5. Voice messages are more forgiving than fax messages. A garbled syllable or word is not often enough to make the whole message unintelligible, but one bad byte can kill a fax.
It's not a scientific analysis, but it's what I've come up with over the past 5 years using this system. Wish I could offer some real assistance, but perhaps a little commiseration will help?
