VoIP SIP Intercom Module

We are planning for Embedded Small size Module for VoIP intercom Hardware Features Support for 12/24VDC Door Latches or 5V Relay 1 10/100 PoE 802.3af Ethernet Connection 400 MHz Processor speed 4 Mbytes Flash, 16 Mbytes SDRAM 4 Ohm Speaker Driver, and 2 UARTs 2 channel Audio Codec with sampling rates up to 48kHz Industrial Temperature: -40°C to +85°C Software Features Fusion RTOS TFTP Client Telnet Server Voice Engine with RTP (includes support for RoIP products) Voice Engine Codecs: G.711 (µ-law, A-law), G.722, G.726 (16/24/33/40 kbps), G.729, DVI4 (narrow/HD/Ultra HD), iLBC, Speex (narrow/HD/Ultra HD), SILK, L16 PCM (narrow/HD/Ultra HD/CD) Data Flash Management (Multi-Partition File System, Advanced Firmware Management, Bootloader, Secure Area) SIP Fusion TCP/IPv4/IPv6 DHCP Client Extensible Command Line Interface Web Server with Extensible Configuration Web App and Configuration and Control Web Services VoIP Call Manager (includes support for incoming calls, outgoing calls, hold, conferencing, transfers, mic/speaker volume control and mute, etc.) Configuration Subsystem (file based or can integrate with other platform standard) Optional Security (SIPS, SRTP) Example Applications include: IP Speaker Phone IP Intercom Systems IP Ceiling Speaker IP Elevator Communications/Music IP Paging IP Door Entry IP Emergency Phones IP Parking Garage Entry IP Audio Streaming I need to give a complete solution, including software and hardware. cpu must use the mainstream arm or dsp chip（）, easy to buy, the price is cheap (less than 7 dollars).