Vadim, I really appreciated your work on osmocom and thanks for your answer.
I did some tests after your suggestions but the second terminal seems not 
connected to a cell. What is wrong, do you have an idea?

Then, the faketrx is open on ports 6700 and 6000 (it seems correct)
[INFO] transceiver.py:104 Init transceiver 'BTS@127.0.0.1:5700'
[DEBUG] data_if.py:36 Init TRXD interface (L:0.0.0.0:5702 <-> R:127.0.0.1:5802)
[DEBUG] ctrl_if.py:32 Init TRXC interface (L:0.0.0.0:5701 <-> R:127.0.0.1:5801)
[INFO] transceiver.py:104 Init transceiver 'MS@127.0.0.1:6700'
[DEBUG] data_if.py:36 Init TRXD interface (L:0.0.0.0:6702 <-> R:127.0.0.1:6802)
[DEBUG] ctrl_if.py:32 Init TRXC interface (L:0.0.0.0:6701 <-> R:127.0.0.1:6801)
[INFO] transceiver.py:104 Init transceiver 'MS@127.0.0.1:6000'
[DEBUG] data_if.py:36 Init TRXD interface (L:0.0.0.0:6002 <-> R:127.0.0.1:6102)
[DEBUG] ctrl_if.py:32 Init TRXC interface (L:0.0.0.0:6001 <-> R:127.0.0.1:6101)
[INFO] fake_trx.py:392 Init complete

The second Trxcon (trx) is offline and the output is :
[...]
<0000> trxcon.c:324 Init complete
<0001> l1ctl_link.c:182 L1CTL has a new connection
<0001> l1ctl.c:427 Received reset request (1)
<0005> sched_trx.c:179 Reset scheduler and clock counter
<0003> trx_if.c:454 read() failed with rc=-1
<0001> l1ctl.c:427 Received reset request (1)
<0005> sched_trx.c:179 Reset scheduler and clock counter
<0001> l1ctl.c:403 Received power measurement request (GSM900: 0 -> 0)
[...]
<0003> trx_if.c:170 No response from transceiver...
<0003> trx_if.c:454 read() failed with rc=-1
<0003> trx_if.c:170 No response from transceiver...
<0003> trx_if.c:174 Transceiver offline

Finally, I modified the config file (multims) I wrote "sim none" (but also and 
"sim test" as in the guide). The telnet output shows the 2nd terminal's service 
is limited:

MS 'one' is up, service is normal
  [...]
  automatic network selection state: A2 on PLMN
                                     MCC=001 MNC=01 (Test, Test)
  cell selection state: C3 camped normally
                        ARFCN=51 MCC=001 MNC=01 LAC=0x03e8 CELLID=0x000a  
(Test, Test)
  radio resource layer state: idle
  mobility management layer state: MM idle, normal service

MS 'two' is up, service is limited
  automatic network selection state: A1 trying RPLMN  MCC=001 MNC=01 (Test, 
Test)
  cell selection state: C1 normal cell selection
  radio resource layer state: idle
  mobility management layer state: MM idle, PLMN search


Regards,
Matteo Gorgo

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