We integrate CCM and Nortel using E1 PRI QSIG and C3845 VG. Nortel is SR4.0 version and CCM is version 4.1(3). CCM is mgcp control C3845 VG E1. After connecting, E1 is up in vg but layer 2 is not up when "sh isdn status". In PBX side, D-channel also not up. How to fix it?