AC494
The AC494 IP Phone Toolkit is a combined hardware and software IP Phone reference design based on the AC494 System on Chip (SoC) family. AudioCodes’ AC494 SoC (System on Chip) family provides IP Phone developers and manufacturers with a single chip field-proven complete IP Phone solution, integrated with superior voice quality at a competitive price.
AC494 SoC (System on Chip)
In a single chip, the AC494 combines all IP Phone components; including a MIPS 4KEC CPU, AC49x DSP and a 3-port Ethernet Switch (MACs and PHYs) together with a rich set of peripherals such as internal CODECS and serial ports. The AC494 is based on the VoIPerfectHD™ architecture (High Definition VoIP) support, AudioCodes' underlying, best-of-breed, core media gateway technology for its product line. Utilizing its highly integrated structure and requiring only a minimal number of peripheral devices, time to market is rapid with little risk.
Several silicon derivatives of this family allow cost optimization per application, which includes the following devices: AC494, AC495, AC496 and AC495L.
| Device | CPU Clock | DSP Clock | USB | Voice CODECs | Eth. Ports |
| AC494 | 165 Mhz | 125 Mhz | V | 2 | 2 |
| AC495 | 125 Mhz | 100 Mhz | - | 2 | 2 |
| AC495L | 87.5 Mhz | 87.5 Mhz | - | 2 | 2 |
| AC496 | 165 Mhz | 125 Mhz | - | 2 | 2 |
IP Phone Toolkit Hardware Design
The AC494 IP Phone Toolkit hardware reference design includes all the peripherals for a complete high-end IP Phone. The AC494 SOC includes the internal interfaces for LCD Display, a keypad, USB, speaker and handset. Additionally, it has a 3-port E-switch and internal MACs/PHYs.

IP Phone Software Development Kit (sdk)
The AC494 IP Phone Toolkit includes a complete Linux Software Development Kit (SDK) supporting voice and network protocols. The software is available in open source code, comprised of separate modules allowing for maximum customization.

Ready to use IP Phones for developers
The AC494 IP Phone toolkit is also available on ready-to-use IP Phones. This allows OEMs and ODMs to develop their software on an actual IP Phone platform.
Toolkit Contents
- Reference & Development IP Phone Platform
- Linux Operating System (Kernel 2.6)
- Free Development Environment (Linux Tool-chain)
- Ready-to-use IP Phone Application (open source code)

Channel Density
- 2 VoIP line support
Hardware
- CPU – MIPS32 4KEC, 165 Mhz
- DSP – AC49x, 125 Mhz
- 2 Integrated 10/100 Base-T MAC/PHY ports
- Integrated 3-port layer-2 Ethernet Switch
- 8x8 Keypad interface
- LCD Interface – Alphanumeric, Graphic, Rasterized
- Integrated SSP (SPI/I2C) Controller
- USB 1.1 Host/Device
- External Memory I/F – Two SDRAM banks, up to 128 MB, Flash up to 32 MB
- Telephony Interface - Integrated dual channel 16 bit CODEC, sampling rate 8/16 KHz
- Five inputs to ADC, four outputs from DAC
- PCM Interface - 2.048 MHz A/μ-Law serial port
- Power Supply - +3.3V (+1.5V core via integrated voltage regulator)
- Power Consumption - 1.88 W (max)
- Operational Case Temperature Range - 0ºC - 70ºC (commercial)
- Package - 324 pin BGA, 23x23 mm, 1.00 mm ball spacing
Telephony Signaling
- DTMF – TIA464B
- Programmable Call-Progress Tones
VoIP Signaling Protocols
- SIP - RFC 3261, 3262, 3263, 3264, 2327
Packetization
- RTP/RTCP Packetization – RFC 3550, 3551, 2198
- DTMF Relay - RFC 2833
Security
- SRTP (Secured RTP) per RFC 3711, 128 bit AES, HMAC SHA1
Media Processing
- Voice Coders - G.711, G.723.1, G.729A/B, G.726, GSM FR, iLBC
- Wideband Coders – G.722, G.722.2 (WB-AMR), G.711.1
- Echo Cancelation – G.168-2004 compliant, 64 msec tail length
- Acoustic Echo Canceler
- Silence Suppression – VAD, CNG
- Adaptive Jitter Buffer 300 msec
Telephony Features
- 3-Way conferencing (on each channel)
- Call Forward
- Call Hold
- Call Transfer
- Call Waiting
Configuration/Management
- Embedded Web
- TFTP
- FTP
- Telnet
- Filesystem Support
Operating System
- Linux Kernel
- Board Support Package
- Single chip complete IP Phone solution
- Superior voice quality at a competitive price
- Field-proven VoIP processor and software
- VoIPerfectHD™ (High Definition VoIP) support
- Combined hardware & software reference design
- Ready to use IP Phone open platforms
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Datasheets
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Brochures
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Application Notes
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White Papers
