After a migration, my DECT's dont have voice

[martin_AB]

Hi, I have a problem with a OmniPCX Office System.
After a migration (R2.1/CPU-1 to R8.1/PowerCPU), the DECTs dont have voice in a IBS.

Te signaling is OK (register, ringing, etc.), but I cant hear the sound (and people cant hear to me when I call from a DECT).

I cant hear the ringaback tone too (I cant hear anything)

The IBS is OK, because it was OK before the migration. Also, I installed a new IBS in the system, and it works fine (so, there is no volumen problem or similar. If fact, I have 7 DECTS, all with the problem).

The IBS is a 4070IO, connected to a UAI8 board (MASTER on ports 3, and SLAVE on port 4), in the same wave before the migration
The firmware and SW Boot of the IBS is:
Firmware: 3BN_64137_AABE_49_03
SW Boot: 3BN_64138_AAAE_72_00

The OXO detects the IBS normally.

I try to reset de IBS (from the OMC), but the problem persists.

Any idea what is happening?

Thanks you!