The Aricent EGT has the following features

Control Plane

• Proven scalability support for up-to 256 lines.
• Support for NAT Traversal of SIP signalling and media using rport and STUN
• Support for Precondition to offer quality of service
• Support for T.38 and clear channel FAX
• Support for sending SIP messages using UDP, TCP or TLS.
• Support for asynchronous DNS query (AA, SRV) for SIP messages and DNS buffering
• Support for IPV4 as well as IPV6
• Support for in-built call session FSM to handle basic voice calls with intercept to applications at appropriate time for application specific function/override.
• Support for authentication of calls.
• Interface with network layer to setup session and bearer path for application level signaling.
• Registration, re-registration and de-registration with the SIP/IP core
• SIP signaling based session control compliant to RFC 3261. This functionality can be used by different applications to setup application specific sessions.
• Support for services for all subscribers
  1. Call Hold and Call Resume
  2. Call Mute and Call Unmute
  3. Call Transfer
     • Call Transfer Attended
     • Call Transfer Unattended
  4. REFER from Network
  5. 3-Way Conference (local merge)
  6. N-way Conference (external merge)
  7. Call Forwarding
     • Call Forward Unconditional
     • Call Forward Busy Line
     • Call Forward No Response
  8. Call Waiting
• Support for multiple streams in call
• Application can specify media preferences per call and per application
• Application can change media codec, codec parameters and mode during call

Media Plane
Interface with a Media Manager for the establishment of media in the network.

• Creation of media stream using RTP as media transport protocol
• Supports application specific Audio/Video Codecs

Configuration Plane

• Configuration of user ids, proxy address, registrar address, service activation/subscription on per line basis
• Configuration of scalability parameters like number of calls, number of lines, number of users etc.
• Comprehensive traces provided along with filtering criteria