[PATCH 1/8] debug: Add DSS category for supplementary service

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sergey kostanbaev sergey.kostanbaev at gmail.com
Wed Nov 25 13:07:18 UTC 2015


Yes, initially I thought about using SMPP for USSD. But it looked really
complicated since only few external SMPP libraries have support of USSD and
most of that few are in C#/Java/etc. Moreover I didn't have any working
software for USSD over SMPP to test interoperability with.

So I decided to use GPRS SUP socket as a simple transport to send MAP-like
messages. Workflow of this SUP is very simple and basically it forwards SS
messages with little modifications.


On Wed, Nov 25, 2015 at 3:22 PM, Holger Freyther <holger at freyther.de> wrote:

>
> > On 25 Nov 2015, at 12:03, Sergey.Kostanbaev <sergey.kostanbaev at gmail.com>
> wrote:
> >
> > From: Sergey Kostanbaev <sergey.kostanbaev at gmail.com>
> >
> > This series of patches add support for external USSD processing via
> > simplified MAP-like protocol over SUP socket. As an example of a such
> > external application simple USSD to SIP proxy is provided (it targets
> > TS 124 390)
>
> Have you considered using SMPP for USSD? At first this looks more natural
> than a custom protocol like SUP.
>
> holger
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