You need to be sure first the CIC mapping in your Asterisk side is the same as on your telco side. Try one call and verify if the busy channel in your side is the same as in your Telco Trunk Group side. To see the CIC used in your side use this: "ss7 debug linkset x" and in the trace verify the CIC: parameter. To see the Telco side, ask your telco operator the CIC value used in the current call. Robert. On Fri, Sep 18, 2009 at 6:01 AM, Rajesh Mahajan <rajeshmahajan09 at gmail.com>wrote: > How to solve this problem ? > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20090918/2f7cd54d/attachment.htm