Has any one ever encountered this? We have 5 T1's to Bell Canada our LP's 10,11,33,76,77. Bell requires 1 DCH which we put on LP 10 (DCH 0)and the BDCH on LP 77 (DCH 23). The DCH establishes so we know our connection is good, however any channels seized on LP 11 or 76 ring at the far end but do...