No speech when TRN an ISDN incoming call from IP to IP set on Brch-Off

[Madil]

Hello all!
Here is the site détails:
x Main office
x Branch Ofiice
x DID pri Card only for incoming call on the BO (assigned to BO IP sets)

The problem is:
1 An IP set on the BO receive a DID call
2 Call istablished
3 Set A transfert the call to set B
4 The external caller here silence, the the communication cut. The set B also can't hear the caller (Some times set B hear the external caller).
The MO is a CS1000M Cabinet R 4.00T:
Call Server/Main Cabinet
========================
DepList name: core
Filename: c:/u/patch/deplist/mcore_11.ssc
Issue: 11
Release: x2104.00t
Created: 06/11/29:08:07
Number of patches: 191
Patches Loaded: 191
Patches In-service: 191
Media Gateway/Expansion Cabinet 1
=================================
Link to the Media Gateway/Expansion Cabinet is reported down.
Media Gateway/Expansion Cabinet 2
=================================
Link to the Media Gateway/Expansion Cabinet is reported down.
Media Gateway/Expansion Cabinet 3
=================================
Link to the Media Gateway/Expansion Cabinet is reported down.
Media Gateway/Expansion Cabinet 4
=================================
Link to the Media Gateway/Expansion Cabinet is reported down.

Summary for dstat command:
+---------+-----------+-----------+-----------+-----------+-----------+
| DEPLIST |SERVER/MAIN| GW/EXP 1 | GW/EXP 2 | GW/EXP 3 | GW/EXP 4 |
+---------+-----------+-----------+-----------+-----------+-----------+
|core | INS | ERR | ERR | ERR | ERR |
+---------+-----------+-----------+-----------+-----------+-----------+
(OK:successfully processed, ---:Not performed, ERR:error occurred, FATAL:fatal

Thank you all in advance!