EC200U-EU - AT trace of an outgoing voice call (test script, 2026-10-30)
Firmware: EC200UEUAAR03A22M08 - port: USB interface 02 (AT), host Linux (Proxmox VE 9.2, LXC container)
Time column = seconds since the script started. Phone number, LAC and cell ID redacted.

[  0.1s] > ATE0 | OK
[  0.1s] > AT+CMEE=2 | OK
[  0.2s] > AT+CLIP=1 | OK
[  0.2s] > AT+QFLST="UFS:appel.wav" | +QFLST: "UFS:appel.wav",389466 / OK
[  0.3s] > AT+CVMOD=0 | OK
[  0.3s] > AT+CVMOD? | +CVMOD: 0 / OK
[  0.4s] > AT+QENG="servingcell" | +QENG: "servingcell","NOCONN","GSM",208,20,<LAC>,<CELLID>,54,980,2,36,5,74,0,32,32,-,-,-,-,-,-,-,-,-,-,"-" / OK
[  0.4s] > ATD<number>; | OK
[  1.5s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  2.5s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  3.6s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  4.6s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  5.7s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  6.7s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  7.8s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  8.8s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
[  9.9s] > AT+CLCC | +CLCC: 1,0,2,0,0,"<number>",129 / OK
Traceback (most recent call last):
  File "appel2.py", line 36, in <module>
    time.sleep(1); r = at("AT+CLCC", 2)
  File "appel2.py", line 19, in at
    os.write(fd, (c + "\r").encode()); r = lire(t)
OSError: [Errno 5] Input/output error

-> The remote phone rings, then the module drops from USB (EIO on the AT port).
