Try POWER OFF (not just restart) BOTH Cabinets and try again.
This is a known issue with early OS7030 2 cabinet configurations. Was fixed with a CPLD upgrade and software upgrade.
I've had many a OS7030 KSU loose the onboard SLT ports. Never had a 4SM card go, but only installed a handfull of these cards at most.
Make sure your 4SM is seated correctly, and your master/slave dip switches are set correctly on the EPM cards.
Also make sure the 3 x CAT5 cables are pushed all...
The OS7030 single cabinet can have a maximum of 18 IP Phones connected.
The OS7030 Dual cabinet can have a maximum of 16 IP Phones connected.
Every 4DM/4SM card reduces the number of IP Phones by 4 for each card (even if there is no handset connected to the port)
You can have as many mailboxes on a single as you want.
It's not like the SVMi4 where if you had a 2 port VM you could only have a certain amount of mailboxes
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