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allow second CS RAB Assignment Request

In the field, we've encountered a so far unsupported scenario: after a
RAB Assignment Request and Response have successfully set up an RTP
stream, the CN sends *another* RAB Assignment Request to modify some SDU
parameters, omitting the transportLayerInformation IE (not modifying the
RTP address).

Detect a secondary RAB Assignment Request, and just forward it as-is:
the hNodeB is interested in the RAB configuration, osmo-hnbgw just needs
the RTP info, which is not even present in this use case.

Do not (yet?) support modifying the RTP address/port.

Related: osmo-ttcn3-hacks Iadaba0e5e82ad6d163ad509904ede213e2462d5c
Related: SYS#6624
Change-Id: I25bf19981cd75a87a7ceb3382dae1ec626ae475c
---
M src/osmo-hnbgw/mgw_fsm.c
1 file changed, 79 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-hnbgw refs/changes/74/34974/3

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