>> Подскажите куда копать.
> DSP (PVDM2) проверяем\меняем.

Да вроде бы должно хватать?

#show inventory
NAME: "2821 chassis", DESCR: "2821 chassis"
PID: CISCO2821         , VID: V04 , SN: FCZ121471GJ

NAME: "2nd generation two port FXS voice interface daughtercard on Slot 0 SubSlot 0", DESCR: "2nd generation two port FXS voice interface daughtercard"
PID: VIC2-2FXS         , VID: V01 , SN: FOC122565JJ

NAME: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0 SubSlot 1", DESCR: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1"
PID: VWIC2-1MFT-T1/E1  , VID: V01 , SN: FOC12336D1D

NAME: "PVDMII DSP SIMM with Two DSPs on Slot 0 SubSlot 4", DESCR: "PVDMII DSP SIMM with Two DSPs"
PID: PVDM2-32          , VID: V01 , SN: FOC11525U9U

NAME: "PVDMII DSP SIMM with one DSP with half channel capcity on Slot 0 SubSlot 5", DESCR: "PVDMII DSP SIMM with one DSP with half channel capcity"
PID: PVDM2-8           , VID: V01 , SN: FOC12371MCA