... 729A/B,PCM A/U code Call forwarding, Call hold, Caller ID, DND standard voice service Anonymous call, Direct IP Call ... customer’s requirements:Supporting many applications such as call forwarding, caller ID, DND, busy tone, conference with IPPBX and Fax over ... G.711 bypassDHCP Client/ServerNAT Router or Switched ModeTelephony FeaturesCaller ID display or block, Call waiting, Blind or attended call ...