Cellular Network Infrastructure » Core Network (CN) » osmo-gbproxy

When a BSS-NSE goes down the corresponding BVCs on the SGSN-side are getting blocked, but still the BVC with all its information (BVCI, CELL, FSM, ...) is still present. If the SGSN later decides to BVC-RESET the BVC the FSM will answer with a RESET-ACK (as well as the correct cell id) and the BVC will then appear to be in working order from the SGSN point of view.

Instead of simply sending a BVC-BLOCK we should also free the sgsn-side BVC. Then the gbproxy will catch the RESET in rx_bvc_reset_from_sgsn() and answer with a STATUS cause "unknown BVCI".