Hi Herald,

Thanks for the quick response! My apologize for the delay - I was close to get it working so wanted to put a mail after.

GSM_TAP was the key - Thank you for this help. External CC works well now.

There was no way I could figure it out, if I hadn't enabled GSM_TAP.

It said "Invalid mandatory information"

Just compared mncc with internal and external CC - Debugged a little further and realized 1 of the fields of bearer_cap was missing!

mncc-python is good - I read your blog. Made some changes (socket path). Although it does fail with "Invalid mandatory information" - bearer cap missing. I will have to look again at the code.

Just an off topic Question.

Osmo-sim-auth and pysim both same projects right?

Reason I asked since, I wrote all SIM API's in osmo-sim-auth and was planning to push upstream and then realized there is a project pysim which has all of that ?

Thanks,

Gerard

On Fri, Mar 17, 2017 at 8:49 AM, Harald Welte <laforge@gnumonks.org> wrote:

hi Gerard,

On Fri, Mar 17, 2017 at 02:47:18AM -0700, Gerard Pinto wrote:
> I have been working with Layer23 stack of OsmocomBB since a couple of
> months.
> I decided to try MNCC socket interface without LCR (I'm aware there is an
> implementation embedded in LCR gsm-ms).

Just a quick note: There's mncc-python at
http://git.osmocom.org/mncc-python/ which you can use to interface from
external programs/scripts, if you'd like.

> Problem: I'm unable to make a call on live network, although it does channel
> allocation, ciphering etc.
> Flow:
> 1. Create MNCC struct and write on to the osmocomBB socket
> 2. OsmocomBB parses it well and request for channel, ciphering mode, init
> MM, sending SETUP etc works great.
> 3. However, in response to step.2 after sending SETUP it returns with (ms 1)
> Received 'RELEASE_COMPL' in CC state INITIATED. Why does it release CC?

It would be best if yo could include GSMTAP protocol traces of such
situations, so one can analyze what happens.

Also, you can compare the traces of working (no mncc?) and non-working
(mncc) cases.

Regards,
Harald
--
- Harald Welte <laforge@gnumonks.org> http://laforge.gnumonks.org/
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