5 Feb
2025
5 Feb
'25
1:38 p.m.
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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