This Avaya IP Office double ISDN-PRI daughter card can be added to an IP500 DS8 card, IP500 Analog Phone (2 or 8 port) card, or IP500 VCM card. It at that point enables that card to likewise bolster two T1, E1 or E1R2 trunk associations. Does not bolster E1R2 COAX. This card underpins 2 physical ports and when arranged as T1, bolsters 48 advanced channels; or when designed as E1, underpins 60 channels. Not good with the IP412.