In libosmcore.git Change-Id I93850710ab55a605bf61b95063a69682a2899bb1,
a new OSMO_GSUP_CURRENT_RAT_TYPE_IE was introduced. Let's add support
for it here, too.
In git commit b76c7fad94 we introduced
support for the GSUP RAT_TYPE IE (0x29). At that time, the
corresponding libosmocore change (Change-Id
I93850710ab55a605bf61b95063a69682a2899bb1) was still in review.
Meanwhile, that change has been merged, and the final IE name now
is OSMO_GSUP_SUPPORTED_RAT_TYPES_IE.
Encoding and decoding of the following GSUP messages were added to support inter-MSC handover functionality:
* E Prepare Handover Request/Result/Error
* E Prepare Subsequent Handover Request/Result/Error
* E Send End Signal Request/Result/Error
* E Forward Access Signalling Request
* E Process Access Signalling Request
* E Close, E Abort, E Routing Error.
Tests for GSUP E Interface messages were added from libosmocore library.
A number of bugs were found in the initial implementation and fixed during the first real tests and after the tests from libosmocom library were added to the code.
This IE was introduced together with inter-MSC handover implementation.
Message Class IE is mandatory for Inter-MSC GSUP messages and optional for Subscriber Management, SS and SMS messages.
Pau Espin
Alexander Couzens
Harald Welte