We have 1 DLI card...tried different ports on it with no luck...to further elaborate, theres not even a tone when the handset or speakerphone is off hook. When I manually key in the trunk, I can hear the pbx click and I can dial out...again I hear no dial tone, ringing, etc. When the party picks up..I can't hear anything from them...and the only thing they can hear from me is if I key numbers.

when I said SLI phone..I meant phones hooked up to the sli card.

Can the DLI card be malfunctioning? I've cleared the memory..reset the system and reset the DLI card...but no luck..