A comparison of Merlin Messaging model numbers with their
original corresponding software revisons:
Model Rel Notes
617A49 1.x No Ethernet support. Upgrade=Replace board
617B49 2.0 Supports GUI admin. Some upgradability from 1.5 via hardware changes.
617C49 2.5 Begin upgradability all the way upto 4.0 w/"one time use" PCMCIA card
617D49 3.0 Supports Unified Messaging and
617E49 4.0 Bells & Whistles. Last manuf. version
This is only a guide, of course. Obviously it's important to know how to retrieve the software version via the Admin mailbox since upgrades could skew the relationship with the board's model number.
But this little note is still handy for those times that you need to punt (which backdoor password to use, for example).
Please add/correct any of my notes here.