Python scripting interface to OsmoNITB/OsmoMSC MNCC interface
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mncc-python/README

2.1 KiB

python MNCC interface for OsmoNITB
(C) 2015 by Harald Welte
======================================================================

I've been working on a small python tool that can be used to attach to
the MNCC interface of OsmoNITB. It implements the 04.08 CC state
machine with our MNCC primitives, including support for RTP bridge mode
of the voice streams.

= Requirements =

mncc-python needs python-pykka, and fysom.

On Debian or Ubuntu you can install them via
sudo apt-get install python-pykka python-fysom

= Getting the code =

The first working version of the tool is available from
http://git.osmocom.org/mncc-python/
or
git clone git://git.osmocom.org/mncc-python

The code is pretty hacky in some places. That's partially due to the
fact that I'm much more familiar in the C, Perl and Erlang world than in
python. Still I thought it's a good idea to do it in python to enable
more people to use/edit/contribute to it.

I'm happy for review / cleanup suggestion by people with more Python-foo
than I have.

Architecturally, I decided to do things a bit erlang-like, where we have
finite state machines in an actor models, and message passing between
the actors. This is what happens with the GsmCallFsm()'s, which are
created by the GsmCallConnector() representing both legs of a call and
the MnccActor() that wraps the MNCC socket towards OsmoNITB.

The actual encoding/decoding of MNCC messages is auto-generated from the
mncc header file #defines, enums and c-structures by means of ctypes
code generation.

The immediate first use case for this was to be able to generate MT
calls to a set of known MSISDNs and load all 14 TCH/H channels of a
single-TRX BTS. It will connect the MT calls in pairs, so you end up
with 7 MS-to-MS calls.

mncc_test.py currently drops you into a python shell where you can e.g.
start more / new calls by calling functions like
connect_call("7839", "3802")
from that shell. Above example initiates MT calls to subscribers with
extension number 7839 and 3802.

Exiting the shell by quit() or Ctrl+C will terminate all call FSMs and
terminate.