EG25-G firmware request — VoLTE not registering on Australian carriers

IoT Modules LTE Standard Module
1

Hi,

I’m running an EG25-G as a SIP-to-cellular voice gateway (via Asterisk + chan_dongle) and cannot make voice calls, IMS fails to register.

Current firmware:
AT+CGMM: EG25
AT+QGMR: EG25GLGDR07A02M1G_01.200.01.200
IMEI: 869387062838553

Carrier: Telstra (Australia, MCC/MNC 505/01)

  • All Australian carriers have shut down 2G and 3G - voice requires VoLTE
  • The Telstra MBN profile is loaded and active (Telstra-Commercial_VoLTE, index 14)
  • AT+QCFG=“ims” returns 1,0 (enabled)
  • AT+CGDCONT? shows IMS APN on context 2
  • AT+QMBNCFG=“AutoSel”,1 is set
  • Data works fine over QMI/ECM (usb0)

Problem: Every ATD returns NO CARRIER. AT+CEER returns 6,267 (IMS not registered). AT+CIREG? returns ERROR (command not supported on this firmware).

What I’ve tried:

  • Enabling IMS: AT+QCFG=“ims”,1
  • Adding IMS APN: AT+CGDCONT=2,“IPV4V6”,“ims”
  • MBN auto-select enabled
  • AT+QCFG=“ims/imsTestMode”,1 → ERROR (not supported)
  • AT+QCFG=“ims/volte”,1 → not tested yet
  • Verified the SIM makes VoLTE calls fine from a Pixel phone (IMS registered, VoLTE available)

Could you provide the latest EG25-G firmware with improved IMS/VoLTE registration for Australian carriers? Ideally a version where AT+CIREG? is supported, so I can debug IMS registration state.

Thanks

2

Hi,

Thank you for the detailed information.

From your description, the data service is working normally and the correct Telstra VoLTE MBN profile is loaded. However, the error +CEER: 6,267 and NO CARRIER during dialing indicate that IMS has not successfully registered, which is why VoLTE calls cannot be established.

Kindly note that IMS/VoLTE behavior is highly dependent on:

  • firmware version
  • MBN profile compatibility
  • operator network requirements

For the EG25-G, some firmware versions have limited IMS debug capability (e.g. AT+CIREG? not supported), and may also have compatibility gaps with certain operators such as Telstra, especially after 3G shutdown.

As for suggestion, I will send you the latest firmware to your email. Please help to upgrade.

3

Hello OP did the firmware work for your application?

4

Dear Customer,

May I know if you are facing any issue? If yes, can you describe the issue and provide the current firmware that you are using.

Thank you.