VoIP Processors (Chips) for VoIP Gateways



The AC491xxx family of DSPs is an ideal solution for high density, carrier class Voice over IP gateways. Featuring high channel density (up to 192 channels of non-compressed voice, or 96 channels of compressed voice), low power consumption (less than 5 mW/ch for non-compressed voice), and low footprint (16x16 mm) with no external memory required, the AC491xxx provides an excellent building block for high density gateways. The AC491xxx is based on VoIPerfect architecture, AudioCodes’ underlying, best-of-breed, core media gateway technology for all of its products. Field-proven, feature rich software and reference design enables the rapid development and fast time-to-market of the complete solution.

Deliver Feature-Rich Technologies
The AC491xxx voice over packet processor combines up to 120 channels of toll quality low bit rate (LBR) voice compression or 240 G.711 channels, which are processed with an improved G.168-2002 compliant echo canceller (configurable tail length of up to 128 msec). Other voice quality enhancers include Adaptive Voice Activity Detection, Comfort Noise Generation and Adaptive Jitter Buffer. Field-proven G3 Fax Relay, compliant with the T.38 ASN.1 standard, is a major enhancement to the AC491xxx offering. The Fax Relay, that can withstand delays of up to 10 seconds in the network, has passed several interoperability tests with major OEMs in the world, and was tested with numerous fax machines. The Fax Relay functionality does not alter
the channel density.

Enhance System Solutions
The AC491xxx also provides RTP/RTCP Packetization and DTMF relay, or AAL2 Packetization. This feature offloads the Packet Processor from such tasks. RTP Packets may be optionally encrypted according to state of the art encryption algorithm AES. The AC491xxx also offers a new set of media processing technologies, such as fast/slow voice playback, automatic gain control, energy detector, and packet to packet Transcoding (LBR to PCM in one channel).
These features enable developers of Media Server Platforms to exploit AudioCodes' vast experience in the voice over packet market for significantly shortening their time-to-market.

Field-Proven Reference Design
By using the AC491xxx in its other high density applications, AudioCodes has the unique capability to offer its VoP Processor customers field-proven reference designs, which are used and tested by customers throughout the world. The AC491xxx offers an easy to integrate Utopia Level 2 interface for media packets, which is suitable for many popular Network Processors. For control packets, an Enhanced HPI interface is used. Suitable drivers are supplied with the AC491xxx for fast software integration.

AC491xxx Features

  • Wireline, wireless & cable low bit rate Voice Coders
  • G.168-2002 compliant Echo Canceller
  • T.38 compliant Fax Relay (does not reduce LBR density)
  • In-Band Signaling, international caller ID support
  • IPmediaTM features
  • PacketCable media encryption (AES)
  • Adaptive Jitter Buffer
  • RTP/RTCP/SRTP Packetization inside