5 Feb
2025
5 Feb
'25
9:25 p.m.
Dear Neels,
I attached the pcap and the MSC logs with the requested debug option enabled:
https://www.transfernow.net/dl/20250205la9yXOex
I checked the codec nego and that seems to be fine, both phones
reports FR/EFR/AMR-FR, the above case is a simple EFR MO --> MT call.
This test was on a Nokia InSite (which can only do FR/EFR), I also
tested it on MetroSite with full AMR capability and it is the same
issue (both EFR and AMR calls fail the same way, FR works as
expected).
Much appreciate your help!
Regards,
Csaba
Neels Hofmeyr <nhofmeyr(a)sysmocom.de> ezt írta (időpont: 2025. febr.
5., Sze, 13:39):
Hi Sipos,
it should certainly work with current osmo-msc. The cause looks like actually
an MS is rejecting the connection. It is not an error report that i remember to
have seen, so nothing in particular comes to mind.
Hence, yes, a pcap might help to understand what is going wrong for you. Also
quite helpful would be at least the osmo-msc log with the 'codecs:' log lines
that you get with 'logging level cc debug'.
BTW, 'mncc-int' is an old config item for internal MNCC and does not have much
bearing on codec decisions, in neither external nor internal MNCC. As I am
looking now, it seems to be entirely unused, actually.
BTW2, a detailed overview of codec decisions is shown in
osmo-bsc/doc/codec_resolution.msc
~N
On Tue, Feb 04, 2025 at 06:53:21PM +0100, Sipos Csaba wrote:
Dear list,
FR calls between mobile phones are working fine, but when I change the
codec-list to
"codec-list fr2 fr1 fr3" or "codec-list fr3 fr1 fr2", I am getting a
Remote Transcoder Failure:
lchan(0-0-1-TCH_F-0)[0x630d01c78b80]{ESTABLISHED}: (type=TCH_F)
CONNECTION FAIL (cause=Remote Transcoder Failure [ 28 ])
In the BSC config:
codec-support fr efr amr
codec-list fr2 fr1 fr3
In the MSC config:
mncc-int
default-codec tch-f fr
default-codec tch-h hr
Both the phones and the BTS is FR/EFR/AMR capable.
I am fairly sure with Osmo-NITB at least EFR was working with these
phones and BTS some years ago.
If needed, I can provide a pcap.
If someone has an idea, please let me know.
Regards,
Csaba
--
- Neels Hofmeyr <nhofmeyr(a)sysmocom.de> https://www.sysmocom.de/
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