Hey,
I am trying to set up test bench for base-band fuzzing using the Osmocom
stack and a couple of SDRs (b210 and bladerf).
I have managed to setup everything to my liking in terms of a functional
network using the tutorial
(
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…)
and the latest stable packages from
https://osmocom.org/projects/cellular-infrastructure/wiki/Latest_Builds
Now I want to enable the silent_call functionality to begin testing but
I can't seem able to do so.
I have reverted the silent_call patch
(
https://gerrit.osmocom.org/#/c/openbsc/+/1930/) for OpenBSC inside the
"new" OsmoMSC but unfortunately that did not work.
I have then started trying to figure out how the silent_call interacts
with the rest of the state machine, but I don't seem to be making much
progress.
Please see attached a log for the communication between OsmoMSC (which
triggers silent_call) and OsmoBSC. The connection seems to fail due to
issues related to either "Congestion" (if GPRS is enabled) or a timeout
of T0 (if GPRS is disabled).
Can anyone help?
Thanks
--
Mihai