You can install up to 49 extesnions in ipLDK-100 with one cabinet.
And you have already done that. See below:
Slot 1 - Mix(6 digital/ 6 Analogue) - 12 extensions
Slot2 - SLIB2e - 12 extensions
Slot 3 - LCOB8
Slot4 - SLIB2e - 12 extensions
Slot5 - SLIB2e - 12 extensions
In slot = 6 you could install VMIB (voice mail) or WTIB (DECT -wireless handsets).
Or: You could install a second cabinet on top of the ipLDK-100.
you already have ipLDK-100 -OneCabinet, but this could be expanded to ipLDK-100 with two cabinets:
LDK 100 - One Cabinet LDK 100 - Two cabinets
1 pcs. Cabinet 1 pcs. Cabinet
1 pcs. MPBN board 1 pcs. LCU cable
1 pcs. ASMU1N board 1 pcs. ASMU2N board
1 pcs. PLLU board
Let me know if you need more.
///doktor