HI I have next problem with blocking cic. Is the same problem as : http://www.mail-archive.com/asterisk-ss7 at lists.digium.com/msg02066.html But I not find answer: I am connected to central 5ESS Log from my console: [Feb 1 15:02:38] NOTICE[10043]: l4isup.c:4159 do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=1, mask=0x00000001. [Feb 1 15:03:08] WARNING[10081]: l4isup.c:1344 t18_timeout: T18 timeout (No "circuit group blocking acknowledge" from peer) CIC=1. [Feb 1 15:03:08] NOTICE[10081]: l4isup.c:4159 do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=1, mask=0x00000001. [Feb 1 15:13:08] WARNING[10081]: l4isup.c:1370 t19_timeout: T19 timeout (No "circuit group blocking acknowledge" from peer) CIC=1. [Feb 1 15:13:08] NOTICE[10081]: l4isup.c:4159 do_group_circuit_block_unblock: Sending CIRCUIT GROUP BLOCKING, cic=1, mask=0x00000001. I use 1.4.3 version of chan_ss7 , 8xE1. My log is http://www.cloudshark.org/captures/86150687cede Are any know how fix this. Thanx Grzegorz Maciak