tree f3624970fb112e54df0a528233420b4fb3c6c736
parent 64e807c4bc81624651b970290db1c6a0b03d8eef
author Vadim Yanitskiy <axilirator@gmail.com> 1523043295 +0700
committer Vadim Yanitskiy <axilirator@gmail.com> 1527783074 +0000

GSUP: implement TCAP-like session management

Unlike TCAP/MAP, GSUP is just a transport layer without the
dialogue/context. This prevents us from having session based
communication, required e.g. for USSD. But we can emulate
TCAP dialogue by adding additional IEs, which would allow
to relate each message to a particular session.

This change introduces the following IEs:

  - OSMO_GSUP_SESSION_ID_IE,
  - OSMO_GSUP_SESSION_STATE_IE,

which optionally can be used to indicate that the message is
related to a session with given ID, and to manage session
state, i.e. initiate, continue, and finish.

Change-Id: I1cee271fed0284a134ffed103c0d4bebbcfde2a8
Related: OS#1597