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osmith uploaded patch set #3 to this change.

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Add subscr_conn_fsm

Insert the BSCNAT's MGW into phone calls by replacing the AoIP
transport layer address IE inside BSSMAP Assignment Request and
Assignment Confirm. Accomplish this with a new subscr_conn_fsm that
parses and stores the original ass_req / ass_conf messages, communicates
with the BSCNAT MGW, and then creates new ass_req / ass_conf messages
based on the original ones but with new RTP information.

With this patch it is possible to do a successful voice call with the
following network:

  MS1 --- BTS1 --- BSC1 --.
           |        |     BSCNAT ----------- MSC
           |        |     |   |              |
           '-- MGW-BSC1 --|-- MGW-BSCNAT --- MGW-MSC
                          |   |
  MS2 --- BTS2 --- BSC2 --'   |
           |        |         |
           '-- MGW-BSC2 ------'

Related: SYS#5560
Related: https://osmocom.org/projects/osmo-bscnat/wiki/Ladder_diagrams_for_key_procedures
Change-Id: I7e491aada6f5db0eb35ef2039869c6ba07f9ca3b
---
M include/osmocom/bsc_nat/Makefile.am
M include/osmocom/bsc_nat/bsc_nat.h
M include/osmocom/bsc_nat/bssap.h
M include/osmocom/bsc_nat/subscr_conn.h
A include/osmocom/bsc_nat/subscr_conn_fsm.h
M src/osmo-bsc-nat/Makefile.am
M src/osmo-bsc-nat/bssap_conn.c
M src/osmo-bsc-nat/subscr_conn.c
A src/osmo-bsc-nat/subscr_conn_fsm.c
9 files changed, 846 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bsc-nat refs/changes/12/27712/3

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