Hi Mesbah, 1. I meant other end and asterisk was configured on ISDN before and was working fine. Now we want to configure them on SS7, so other end and asterisk is configured as SS7 now. 2. asterisk4*CLI> ss7 show linkset 1 SS7 linkset 1 status: Down Note: Even on Telsis link is showing offline. 3. ss7linktest [root at asterisk4.uk:~]$ /root/download/libss7-1.0.2/ss7linktest 16 itu <telsis pc> <telsis pc> Could not open device 16: Device or resource busy --- Kind Regards, Deepika Nijhawan VoIP Engineer Oxygen8 Communications T: +44(0) 871 434 9151 +44(0) 121 620 9151 Email: deepika.nijhawan at oxygen8.com Skype: deepika-nijhawan W: <http://www.oxygen8.com/> www.oxygen8.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100518/1698977c/attachment.htm