I was upgrade PBX from R6.2 to R8. Change CP and convert DataBase. All work fine.

Once day LT slot 0 in the PIM1 is blocked.
All 8 SLT phones haven't dial tone. Only LED's lights up when I try dial. Cable and connections OK.

I reset PBX, reset ports by CMEB2, reset card, clear all ports, write 8DLSP card in this slot and 8LCAA back but failed

How to unblock slot ?
I suppose this is error in memory. When I assign new Dterm PBX always write WRONG in CM93.

some details

PIM0
8COTR - 3
8DLCP - 3
8LCAA - 1
8RSTG - 1
30PRTA -1
30DTCC - 1
SC01(DCH) -1
CP24B R8

PIM1
8LCAA - 8
AP00B - 1

PIM2
8LCAA - 8
30PRTA- 1
CP15 - 1

Might be corrupted memory blocks.

You can "throw away" memory blocks by un-programming the phone, programming a phantom, then programming the phone back (in a new memory block, because the old one was used up by the phantom).

CM F52>xxxx> will show you the memory data for the analog single-line phone.

But you say eight ports are doing this?

Have you swapped 8LCAA cards?

Are you licensed for enough timeslots?
F88>01> should be 03 or more
F88>10> should be 192 or more

But you also have two E-1s, so perhaps it should be
F88>01>04 and F88>10>252 or more

CM F88 is not listed in the Command Manual published in Feb 2004, so it may be changed in later software.

And F88>10> sometimes says 064 when it's really higher. Go by F88>01> and multiply by 64 to get the true number of licensed ports.

Yes of course. I have swapped 8LCAA cards.

F88>10:TDM Ports :0512
F89>01:512-Port Basic :A
for all 2000 IPS in Russia

"You can "throw away" memory blocks by un-programming the phone, programming a phantom, then programming the phone back (in a new memory block, because the old one was used up by the phantom).
"
It's good idea ! I will try this.

Thank you, telephoneguy .