Hello,
We have 4 ISDN PRI's from ATT provisioned as a trunk group with 1 primary D-channel and 1 backup D-channel. In the Codian gateway under the port configuration, it only gives the option of Primary or None for D-Channel type. How can we designate a backup D-channel? L1/L2 status shows Up on my end, but ATT shows the D channels locked on their side, and I'm getting "parse_q931_header: invalid protocol discrimator" warnings in the log. All other configurations match up to what they have (type National, NFAS interface ID's, etc.).
Thanks,
Mike