OpenBSC USSD external application

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Ivan Kluchnikov ivan.kluchnikov at fairwaves.co
Fri Sep 8 09:16:35 UTC 2017


Hello Rowan,

You should use:
for libosmocore: fairwaves/master-rebase branch
for openbsc: fairwaves/master-rebase branch and use
./configure --enable-ussd-proxy

2017-09-07 21:15 GMT+03:00 Rowan Phipps <phippsr at cs.washington.edu>:

> Do you know which version of libosmocore that branch worked with?  I have
> tried it with both the master branch and the fairwaves/master-rebase branch
> and neither one compiled.  I also tried rebasing the
> fairwaves/master-rebase onto master again.  This at least builds but it
> looks like osmo-nitb is sending a different version of SUP than what
> libosmocore is expecting and so it can't decode it.  The function in
> libosmocore that seems to do the decoding is osmo_gsup_decode in gsup.c
>
> I have seen references to be SUP and GSUP in the code.  Are these two
> different protocols or are they the same thing?  Also, are they specified
> anywhere other than in the code?
>
>
> On Sat, Sep 2, 2017 at 2:11 PM Alexander Chemeris <
> alexander.chemeris at gmail.com> wrote:
>
>> Hi Rowan,
>>
>> A more recent version of this work is a part of the
>> fairwaves/master-rebase branch. It has implementation of exporting
>> USSD (and any other SS for that matter) over a SUP socket and an
>> external utility to decode/encode them and convert to/from SIP+XML
>> similar to defined in the IMS standard.
>>
>> We're currently using this code to implement external USSD services
>> like a balance check from a billing system and also to forward SS and
>> USSD to MAP/Sigtran. So I think the code should work well for you.
>>
>> If you find this code useful, we would greatly appreciate any help in
>> merging this code into master. We intend to eventually merge this into
>> master, but it requires some cleanup before it could be submitted for
>> a review and given it's not a simple small change we've never had
>> enough time to do that so far :(
>>
>> On Wed, Aug 30, 2017 at 10:59 PM, Rowan Phipps
>> <phippsr at cs.washington.edu> wrote:
>> > Hi,
>> > I’ve been looking into getting ussd working with an external
>> application. I
>> > found a branch from last year (fairwaves/sup-ussd) that looks like it
>> has
>> > implemented most of ussd sessions and possibly communicates with an
>> external
>> > application. Does anyone know if it was finished or what still needs to
>> be
>> > done?
>> >
>> > I also found a python script called ussd_example.py which looks like it
>> is
>> > supposed to act as a gateway and receive used connections from openbsc.
>> Is
>> > this correct and did it work or am I misunderstanding its purpose?
>> >
>> > Thanks!
>> > - Rowan Phipps
>>
>>
>>
>> --
>> Regards,
>> Alexander Chemeris.
>> CTO/Founder, Fairwaves, Inc.
>> https://fairwaves.co
>>
> --
> Thanks!
>     - Rowan Phipps
>
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