Hi Mychaela,
On 01.12.2023 23:01, Mychaela Falconia wrote:
Of course the MS Classmark does not contain any bits related to the
codec support. I meant to say the Bearer Capability, but wrote this
instead. In any case, for the sake of completeness, I will compare both
the Bearer Capability and the Classmark between those firmware versions
and post my findings here soon.
I did some tests in my own Osmocom based network and found out that both
R1AA003 and R1AA008 look identical on the radio interface, and more
specifically both phones do indicate both AMR FR and AMR HR as supported.
You can find the Classmark and the Bearer Capability bits in my small
classmark collection, which I just uploaded here:
https://people.osmocom.org/fixeria/classmark/
https://people.osmocom.org/fixeria/classmark/se_k200_R1AA003.txt
https://people.osmocom.org/fixeria/classmark/se_k200_R1AA008.txt
I find it very intriguing that a phone manuf created a hidden service
menu command that (presumably) enables or disables AMR inclusion in
the advertised speech version list. I would find it very interesting
if you could check with your test network to see if that hidden service
menu setting really does what I just assumed. As to possible reasons
why they thought about artificially disabling AMR, please refer to the
Calypso presentation I just did on OsmoDevCall: AMR support in plain
Calypso (as opposed to LoCosto or*possibly* Calypso+) is crippled in
that it can't do DTXu - hence you have to choose between DTXu (battery
saving) and AMR (potentially better call quality under poor radio
conditions) with all Calypso phones...
You can enter this menu yourself by entering the following sequence:
-> * <- <- * <- *
("->" is right, "<-" is left)
This service menu cannot be used to enable or disable specific speech
codecs. It has the following hierarchy:
* Service info
** Model info
** Software info
** Configuration <--
** SIM lock
* Service settings
** Contrast
* Service tests
** ...
* Text labels
and "Configuration" is the sub-menu in which I found the AMR state.
Somehow it does not agree with the Bearer Capability sent by R1AA003.
--
Best regards,
Vadim.
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