
Draytek VigorIPPBX N22P ISDN TE/S0 Module
Draytek VigorIPPBX N22P ISDN TE/S0 Module provides two switchable TE/S0 ports and two fixed S0 ports. The S0 ports (sometimes called NT ports) )are for connection to an existing ISDN PBX trunk port (input). Find out more at voip.com.vn