Hello, I have one card and I make a link between port 2 and port 3 with a T1 cable: My ss7.conf: [linkset-siuc] enabled => yes enable_st => no use_connect => yes hunting_policy => even_mru subservice => auto context => ss7 language= en [link-l2] linkset => siuc channels => 1-15,17-31 schannel => 16 firstcic => 25 enabled => yes [link-l3] linkset => siuc channels => 1-15,17-31 schannel => 16 firstcic => 56 enabled => yes [host-systemtest] enabled => yes opc => 0x1 dpc => siuc:0x2 links => l2:2 [host-systemtest] enabled => yes opc => 0x2 dpc => siuc:0x1 links => l3:3 My zaptel.conf : span=2,1,0,ccs,hdb3 bchan=25-55 span=3,0,0,ccs,hdb3 bchan=56-86 loadzone=uk defaultzone=uk And in asterisk CLI: systemtest*CLI> ss7 link status linkset siuc, link l2, schannel 16, NOT_ALIGNED, rx: 0, tx: 4/4, sentseq/lastack: 127/127, total 6751328, 6751392 Do you have a idea for me ? Tks, Thomas