Hello, One of my Carrier has a Ericsson Switch and if i try to make a SS7-link with them they send a STD-Test and it seems like that Asterisk is nothing reply, so the Ericsson Switch set the link down. Here the packages: [2] Link state change: ALIGNEDREADY -> INSERVICE [2] Len = 22 [ [2] ff [2] 80 [2] 11 [2] c1 [2] 70 [2] 20 [2] 03 [2] 0c [2] 11 [2] a0 [2] 32 [2] 35 [2] 36 [2] 34 [2] 32 [2] 38 [2] 36 [2] 32 [2] 38 [2] 38 [2] 00 [2] 00 [2] ][2] FSN: 0 FIB 1 [2] BSN: 127 BIB 1 [2] > MSU [2] Network Indicator 0x3 [2] OPC 1 DPC 2 [2] User Part: STD_TEST (1) Priority: 0 [2] H0: 1 H1: 1 [2] Message type: COO [2] [2] Len = 27 [ [2] ff [2] 80 [2] 16 [2] c1 [2] 62 [2] 22 [2] 03 [2] 0c [2] 11 [2] f0 [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] aa [2] 4b [2] 95 [2] ] [2] FSN: 0 FIB 1 [2] BSN: 127 BIB 1 [2] < MSU [2] Network Indicator 0x3 [2] OPC 1 DPC 2 [2] User Part: STD_TEST (1) Priority: 0 [2] H0: 1 H1: 1 [2] Message type: COO [2] Is it possible to solve this Problem? Thanks a lot Nico