modem terminates call when accepted remotely

Thu Mar 23 13:03:35 UTC 2023

Hi, Alex, thanks for your quick answer.
Nice to know you worked at Elecnor/Deimos Space 😊

This is definitely a bug to fix. That transition to "terminated" shouldn't happen when the callee picks up the call. Can you get MM debug logs while reproducing the issue? Also, is this using AT or QMI?
Two logs are attached: one with transition from ringing-out to active and another with the wrong state transition (ringing-out -> terminated).
At first sight I couldn’t find any significative trace to explain this behavior, I hope you can get some related info in them.

1.18 or 1.20 you mean I guess. Either way, the solution is to avoid getting into that wrong terminated state I think.
Could be due to some update in recent versions. We did include the call list management logic as well as the waiting call setup logic. Maybe some of that is not working as expected in your Sierra modem.
We updated another device to 1.12 ModemManager version and we still cannot reproduce this issue in that device (our software is using “mm_modem_voice_hangup_all_sync” and compiling well against 1.12 ModemManager version), so we still cannot say wether it’s a hardware related issue or not. We will continue testing and any interesting information or logs we get will be provided to this mail list.

Thank you!

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Héctor Jiménez Méndez
Firmware engineer

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De: Aleksander Morgado <aleksandermj at chromium.org>
Enviado el: martes, 21 de marzo de 2023 11:43
Para: Héctor Jiménez Méndez <hector.jimenez.m at gmv.com>
CC: modemmanager-devel at lists.freedesktop.org
Asunto: Re: modem terminates call when accepted remotely

Hoola Héctor!

First of all, I would like to thank you all your effort to develop and maintain this API as it’s being very useful to us for handling modem connections in our embedded devices.

I'm really glad to see GMV is using all this :) I worked at Elecnor/Deimos Space in a past life!

We are facing an issue with ModemManager 1.16.2 (libmm-glib) and RC7620 SIERRA modem.

Sometimes, after starting a call to another SIM card device (mobile phone), the call gets into “terminated” state (seen by ModemManager) in the moment the call is accepted by the remote device, while it remains active at this remote point.

The call state becomes “dialing”, then “ringing-out”, and finally “terminated” so there is no option to finish the call from ModemManager side as it’s seen as already terminated.

This is definitely a bug to fix. That transition to "terminated" shouldn't happen when the callee picks up the call. Can you get MM debug logs while reproducing the issue? Also, is this using AT or QMI?

We managed to actually finish the call (remote side too) by the use of  ”mm_modem_voice_hangup_all_sync” function (defined in mm-modem-voice.h), but it’s only available since ModemManager 1.12 Version.

1.18 or 1.20 you mean I guess. Either way, the solution is to avoid getting into that wrong terminated state I think.

Some of our devices are using other hardware and older versions of ModemManager (1.10) and we have never been able to reproduce this issue so we didn’t need to make use of “mm_modem_voice_hangup_all_sync” function.

Could be due to some update in recent versions. We did include the call list management logic as well as the waiting call setup logic. Maybe some of that is not working as expected in your Sierra modem.

I would like to know if this issue has been already reported, and if so, if it has been resolved or if it’s related to the hardware we installed on our device or, on the other hand, if has something to do with the ModemManager version being used.

Don't recall an issue like this, truth be told.

Cheers

--
Aleksander

P Please consider the environment before printing this e-mail.
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