OSMO-MSC External MNCC integration with FeeSwitch

[Justin]

Hi Neels,

Thank you for your suggestions. I'll try this and feedback once I've simulate this on my test setup.


Regards,
Justin

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________________________________
From: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Sent: Friday, November 5, 2021 6:17:26 PM
To: Justin <justin.repollo at entropysolution.com>
Cc: openbsc at lists.osmocom.org <openbsc at lists.osmocom.org>
Subject: Re: OSMO-MSC External MNCC integration with FeeSwitch

> I'm trying to work out using half rate channel in my testbed setup but unfortunately, I'm getting an error message Originate Failed. Cause: INCOMPATIBLE_DESTINATION. Do I need to adjust some configurations in OSMO to make it work?

Codec negotiation is quite broken in OsmoMSC. Patches to fix that are tested
and have been almost-ready for years now, unfortunately there was not
sufficient human resource available to fully finish and merge them.

To use proper codec negotiation from MS thru SIP, you may try using:

osmo-msc branch neels/mncc_codecs3
osmo-sip-connector branch neels/codecs3

(The last actually tested versions were neels/mncc_codecs2 and neels/codecs2, I
just now rebased those onto current master and resolved some conflicts, however
don't have the time to also test them. So if 3 fails, you may also try 2.)

Without above patches, the codec in osmo-sip-connector is actually hard coded
and you will be able to use only that single codec, chosen by actually patching
the source code of osmo-sip-connector.

*With* above patches, a) codec selection is based on more information in
osmo-msc, and b) the codec is properly transported through to the SDP that ends
up in the SIP and back from SIP to the MSC.

Feedback would be appreciated! If these patches help you, then it confirms
(again) that someone should fund us to work on merging them...

Thanks!
~N
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