External interface for USSD
we already have SMPP for SMS, but don't have similar functionality for USSD, i.e. a way in which external applications can exchange USSD with MSs.
There are some provisions for USSD in SMPP, but I think they don't really appreciate the session-oriented nature of USSD.
In either case, I'm not aware of any standard to hand USSD to external applications. Of course there's MAP, but nobody wants to implement that in an external application...
If anyone has and/or can record LAPDm traces of USSD sessions with a commercial
network or even MAP traces, I would be more than happy.
There is a sample capture:
but one is too trivial...
Oh, WOW! I've just found a MAP trace with lots of USSD sessions.
This is exactly from where I took the pictures above.
- File ussd_ms_init.png ussd_ms_init.png added
- File ussd_net_init.png ussd_net_init.png added
- File ussd.xml ussd.xml added
I've visualized some possible USSD-session examples...
The images are created using https://draw.io, and can be opened
and edited (source XML attached) there.
- Status changed from In Progress to Feedback
- % Done changed from 50 to 90
The new changes which implement support of both MS-initiated and network-initiated
SS/USSD transactions have been send to review:
The only missing part at the moment is notification about errors,
e.g. when Paging of a subscriber is failed, or when a message decoding is failed.