problems with QMI dual stack connections from MM - works with qmicli

Bjørn Mork bjorn at
Tue Apr 27 18:16:09 UTC 2021

Reinhard Speyerer <rspmn at> writes:

> from the observed behaviour AT+QMBNCFG="AutoSel",1 seems to have a similar
> semantics as the Sierra Wireless PRI "AUTO-SIM" feature discussed recently
> without the need for a device reboot. Depending on the IMSI and/or other
> properties of your SIM AT+CGDCONT entries may be created/overwritten
> and certain contexts e.g. for IMS may automatically be activated.
> Obtaining S1AP traces in the network or QCDM logs on the device and checking
> the NAS EPS signalling might be a good way to validate your assumption about
> the firmware vs APNs above.
> If that doesn't explain the effects observed at the QMI level you could try
> AT+QCFG="volte_disable",1 (if it is set to 0)
> AT+QMBNCFG="AutoSel",0
> AT+QMBNCFG="Deactivate"
> power cycle the modem and check if anything changes.

Thanks!  That made all the difference!  OK, I should have just taken the
advice wrt these settings before.  Why do they enable this by default?
It looks pretty broken.

"volte_disable" was set to 0.  I guess that explains that "ims" thing?

So I never got around to the MBIM testing.  But given these results, I
assume I would have had similar issues there.  This appears to be a
Quectel specific configuration problem.

Well, back to testing MM without all the modem imposed confusion.


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