Oliver Smith
9b3de0183b
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
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