Carrier name and code "not matching" in the output of modemstat of Digi Transport WR modem

Digi TransPort WR (Series)
1

Hi, I am wondering how to interpret the situation where the name of the carrier (“Telstra”) does not match the carrier code (“50502” = Optus) in the output of the ‘modemstat ?’ command. I am confident that this is not a bug I just don’t know how to interpret this. Is this related to roaming???

Example:

      GPRS Registration: Registration denied
                Network: Telstra, 50502

Output

modemstat ?
                Outcome: Got modem status OK
                   Time: 1 Apr 2002 15:17:43
                  ICCID: ...
                   IMSI: ...
             SIM status: Ready
        Signal strength: -80 dBm
       Radio technology: LTE
   Signal quality (LTE): RSSI -80 dBm, RSRP -116 dBm, RSRQ -19.0 dB, SINR -2.2 dB
             Radio band: E-UTRA Operating Band 5
                Channel: 2460
           Manufacturer: Sierra Wireless, Incorporated
                  Model: MC7430
                   IMEI: ...
                   MEID: ...
                    MDN: Not provisioned
                    MIN: Not provisioned
               Firmware: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
               Bootcode: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
       Hardware version: 1.0
    Firmware Carrier ID: TELSTRA_002.067_001
 GPRS Attachment Status: Not attached
      GPRS Registration: Registration denied
                Network: Telstra, 50502
       Preferred system: Auto
            Temperature: 25C
            Current SIM: 1

Thanks for your help.