Features and Specifications The  Total Access 900e Series products have the following features: • Support for 4  DS1  (or 3  DS1  plus  1 PRI/CAS,  or 2  DS1  plus  2 PRI/CAS)  interfaces • Support for a single built-in FXO interface • Support for up  to 24  FXS  ports  with  octal FXS daughter board • Support for up  to  16  FXS ports  and  8  FXO ports  with  octal FXO  daughter  board  (Total Access 924e  only) • Supports Primary Rate ISDN (PRI) or Robbed  Bit Signaling  (RBS) on the PRI/CAS interfaces • Support for a two  auto  MDI/MDX 10/100BaseT Ethernet ports (RJ-48C) • Full-featured AOS IP router/firewall • QoS/NAT/DHCP client, server, and relay • Support for SIP trunks • Support for up to 6 Mbps of  multi-link Frame Relay,  multi-link PPP • Support for optional VPN - 500 IPSec tunnels using  DES/3DES/AES encryption • Support for 3-way conferencing • Support for caller ID, message waiting,  and stutter dial  tone • Fax and  analog  modem compatible  (V.90) • Support for local station to station calls • Up to  48  channels  of G.711  (µ-law) • Up to  48  channels  on  G.726 (32K  ADPCM) • Up to 48  channels on  G.729 • Up to  48  channels  of  DTMF detection/generation