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Software-only VoIP stack ships first on Linux, ARM

May 24, 2004 — by LinuxDevices Staff — from the LinuxDevices Archive

Trinity Convergence is shipping its software-only voice over IP (VoIP) suite for embedded Linux on an ARM core. The stack enables developers to build a wide range of cost-sensitive VoIP devices using standard, low-power embedded processors, rather than “costly and power-hungry” application-specific integrated circuits (ASICs) and digital signal processors (DSPs), Trinity says.

Trinity's VeriCall Edge app stack is available now for embedded Linux on ARM's ARM926EJ-S microprocessor core. The stack is said to comprise a flexible framework that includes the principal VoIP functions, including: G.711, G.726, G.729 A/B, GSM/AMR, EVRC, and SMV voice coders, voice activity detect, packet loss concealment, acoustic and line echo cancellers, DTMF detect and generate, jitter buffer manager, RTP/RTCP/UDP/IP, and an embedded SIP stack for call control on a single chip solution. According to Trinity, it can be used to build:

  • VoIP Phones
  • Analog telephone adapters
  • PDA based VoIP (over Wi-Fi)
  • Voice over Wi-Fi handsets
  • Dual-mode cellular handsets (cellular and voice over Wi-Fi)
  • Integrated access devices
  • Residential VoIP gateways
  • Broadband access equipment
  • VoIP-enabled routers

ARM says its ARM9E family of DSP-enhanced 32-bit RISC processors target applications requiring a mix of DSP and microcontroller performance. The family includes the ARM926EJ-S processor, the ARM946E-S processor, the ARM966E-S processor, and the newly released ARM968E-S processor, optimized for low-cost information and networking applications. The processors include signal processing extensions to enhance 16-bit fixed point performance using a single-cycle 32 x 16 multiply-accumulate (MAC) unit, and implement the 16-bit Thumb instruction set. The ARM926EJ-S processor also includes ARM Jazelle technology, which enables the direct execution of Java bytecodes in hardware.

“The VeriCall Edge platform and the ARM926EJ-S processor combination is a compelling approach for OEMs to implement the most cost sensitive VoIP SOHO devices,” said Mike Inglis, executive vice president of Marketing at ARM.

Trinity CEO Salim Bhatia added, “The highly portable nature of the VeriCall Edge platform enables OEMs to leverage the price, power, and performance curves of any semiconductor vendor employing the ARM9E core family.”

Trinity also plans to offer optimized, Linux-native versions of the portable C software suite for MIPS32, Intel XScale, and PowerQUICC II & III. It also plans support for other embedded operating systems, eventually.

Trinity first announced VeriCall Edge in September, 2003; see that announcement for additional details.

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