A Low Cost VoIP Reference Design for Consumer and Industrial Applications

VoIP Overview

This VoIP solution combines best-of-breed technologies from Freescale Semiconductor, Mentor Graphics, Global Edge and TeleSoft International. The TeleSoft CompactSIP stack is integrated with the Mentor Nucleus RTOS & TCP/IP stacks together with the Global Edge codecs and ported to the Freescale Coldfire MCF5234/5 VoIP EVM to create a complete low cost VoIP reference design. The software components are designed specifically for embedded solutions and require a minimum of memory space and processor bandwidth. This efficient and cost effective solution has a low cost of manufacture and is ideal for OEMs and ODMs wanting to minimize their technical risks while accelerating time-to-market of their products.

Applications

Primary applications include IP Phones, Mobile Phones, PDAs, Set-top boxes, IP PBXs, ATAs IADs, Voice Gateways, Medical Instrumentation, Fire/Security, Factory Automation, POS CPEs and ATMs.

Features

CompactSIP

The CompactSIP SDK from TeleSoft International is a highly optimized SIP stack solution that combines a very small memory footprint for high performance with no compromises on functionality and scalability. Space-efficient operation and superior performance are maximized due to use of hand-crafted parsers that avoid typical code bloat caused by parser generators.

Nucleus PLUS RTOS

The Nucleus PLUS RTOS from Mentor Graphics Embedded Systems Division is a high performance micro kernel based real-time, multitasking operating system designed specifically for embedded applications requiring deterministic, real-time responses while consuming a minimal memory footprint.

Nucleus NET TCP/IP

The Nucleus NET TCP/IP stack from Mentor Graphics Embedded Systems Division is a feature-rich TCP/IP stack that is highly versatile, small, quick in execution and ideal for real-time, multi-tasking applications such as VoIP. Nucleus NET includes a sockets API for ease of adding a range of applications.

Global Edge

The voice codecs and analog functions from Global Edge Software are customized and integrated with the hardware and software modules to provide a clean and efficient VoIP solution.

TeleSoft CompactSIP Features:

• RFC 3261 – SIP: Session Initiation Protocol
• RFC 3262 – SIP Reliability (PRACK)
• RFC 3263 – SIP: Locating SIP Servers
• RFC 3264 – SDP Offer/Answer
• RFC 3265 – SIP   Specific Event Notification
• RFC 1321 – MD5: Message Digest Algorithm
• RFC 2327 – SDP: Session Description Protocol
• RFC 2617 – HTTP Authentication
• RFC 2806 – URLs for Telephone Calls
• RFC 2833 – RTP Payload for DTMF Dial Digits, Telephone Tones & Telephony Signals
• RFC 2915 – NAPTR: Naming Authority Pointer
• RFC 2976 – SIP INFO Method
• RFC 3204 – MIME Objects for ISUP and QSIG
• RFC 3489 – STUN: Simple Traversal of User Datagram Protocol (UDP) Through NATs
• RFC 3550 – RTP: Real-Time Transport Protocol
• RFC 3515 – SIP Refer Method
• RFC 3581 – An Extension to SIP for Symmetric Response Routing
• RFC 3665 – SIP Basic Call Flow Examples
• DNS Query/Response

CompactSIP is tight and fast:

• Support for methods, headers, and message processing is configurable to save memory.
• Smallest configuration fits in less than 100KB.
• Just-in-time parser avoids parsing headers not used by SIP stack or application.
• Optimized handling of timers avoids high start/stop overhead.
• Crafted parser eliminates parser-generator bloat.

CompactSIP is easy to use:

• Low-level API provides complete control over all SIP functions and message content.
• API supports multiple independent services including multi-homing.
• Easy to add special method & header processing.
• Separate SDP and SIP parsers.

CompactSIP ports to any environment:

• Portable to all memory models, including flat, heap, pool-based, and mbuf or zbuf.
• Object-oriented API supports direct function-call interface, inter-task and inter-cpu messaging.
• Highly scalable – no built-in limits other than those required by the system itself.

CompactSIP provides a broad development and debugging environment:

• Sample applications demonstrate usability of APIs.
• Debugging features provide compile-time/run-time details for messages & event logging.

TeleSoft International is a US-based, leading provider of “Protocols for Developers” for telecom applications. We license source code Protocol Stacks for VoIP, PPPoA, PPPoE, ISDN, Q.931, Q.921, QSIG, ML-PPP, PPP, Frame Relay, T1 RBS, E1 CAS R2 & X.25 to OEMs and ODMs worldwide.

Note: Information in this datasheet is preliminary and subject to change.

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