Neels Hofmeyr
03d015e786
These changes will allow dynamically negotiating AMR rates between 2G and 3G, and between full-rate and half-rate, spanning from 2G and 3G RAN all the way across to SDP over MNCC / SIP and back. To ran_msg_assignment, add a full codecs list (sdp_audio_codecs). So far, there was only the gsm0808_channel_type with a list of permitted-speech entries, which is not a complete representation. This patch only adds the list, the two users of this are added in separate patches: [2/3] In ran_msg_a.c for 2G: Before this, we pass a gsm0808_channel_type to ran_msg_assignment, and from *that* we derive a gsm0808_speech_codec_list -- this loses the AMR rate config bits. So far, we always transmitted the default cfg bits defined in gsm0808_speech_codec_defaults, enabling all supported S0-S15 AMR rate combinations. Instead, we'll directly derive the available AMR rates from the list of SDP codecs resulting from the codecs filter. [3/3] In ran_msg_iu.c for 3G: Before this, we compose a fixed set of RAB SDU subflows, i.e. for exactly and only AMR 12k2. Now, we'll ask for RAB subflows corresponding to the AMR codec's mode-set fmtp present in the codec list. Change-Id: Ia9f4ad7f3646556aadc632bc5ffa477941626c5f |
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README.md
osmo-msc - Osmocom MSC Implementation
This repository contains a C-language implementation of a GSM Mobile Switching Centre (MSC) for 2G (GSM) and 3G (UMTS). It is part of the Osmocom Open Source Mobile Communications project.
OsmoMSC exposes
- A over IP towards BSCs (e.g. OsmoBSC): 3GPP AoIP or SCCPlite
- IuCS over IP towards RNCs / HNBGW (e.g. osmo-hnbgw)
- The Osmocom typical telnet VTY and CTRL interfaces.
- The Osmocom typical statsd exporter.
OsmoMSC implements
- mobility management
- call control (either via built-in MNCC handler or external osmo-sip-connector)
- USSD (exposed via GSUP)
- SMS (either via built-in SMSC or external via GSUP)
Homepage
You can find the OsmoMSC issue tracker and wiki online at https://osmocom.org/projects/osmomsc and https://osmocom.org/projects/osmomsc/wiki.
GIT Repository
You can clone from the official osmo-msc.git repository using
git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-msc
There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-msc
Documentation
User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.
Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY Reference Manual
Mailing List
Discussions related to osmo-msc are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.
Please observe the Osmocom Mailing List Rules when posting.
Contributing
Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details
The current patch queue for osmo-msc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-msc+status:open
History
OsmoMSC originated from the OsmoNITB project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OsmoNITB had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks.
OsmoMSC was one of the parts split off from the old openbsc.git.