Dear asterisk-ss7 group members, just to share my satisfaction :) i've spent all the night setting up Asterisk/Libss7 (Sangoma A101)<---> Siemens GSM SW Finanlly it was a succes all the links are up, My first bloking point was the installation of the sangoma drivers fiinally it worked (with Fedora 9 and wanpipe 3.3.15). The second blocking point was the configuration of Dahdi, it worked with span=1,1,0+ccs+hdb3 (no crc4) in system.conf and in wanpipe1.conf: - comment out TDMV_DCHAN - Disable HW EC - NCRC4 instead of CRC4 Asterisk-trunk+Libss7-trunk+dahdi trunk I have noticed that: ss7 set debug on linkset 1 replies "DISABLING debug on linkset 1) and ss7 set debug off linkset 1 replies "ENABLING debug on linkset 1) best regards,