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3com - SIP Solutions
Active Buddy - Software development kit (SDK) and server
Aculab - Prosody S HMP with SIP enables the creation of SIP-based IP contact centres and virtual IP-PBX solutions for hosted/SIP trunking deployments. It also enables T.38 fax; HD voice conferencing and video.
ANDROME - Intellivic SDK – APIs allowing RAD of new SIP based video telephony solutions or integration of video telephony in existing applications. Supports all major SIP standards; audio and video codecs.
ASTA Technolgy Group Inc - ASTA SIP SDK allows you to deploy full featured SIP applications using: .NET and Winforms, .NET and Compact Framework for PocketPC, Delphi, Visual Basic 6
BlueNote Networks; Inc. - Internet telephony software that combines SIP based voice and video with web services in an enterprise SOA to provide an alternative to today's VoIP and IP PBX solutions.
Compaq - SIP stack implementation.
Continuous Computing Corp - CCPU's award-winning boards, systems and high-availability middleware products will be enhanced with the complete suite of Trillium protocols such as H.323, MGCP, SIP, GPRS, IMT-2000, SS7 and SIGTRAN.
Cosystech - SIP-H.323 Converter
CTL Inc. - Delivering SIP Integration Solutions for IP Telephony.
Eyeball Networks - Eyeball Messenger SDK provides application developers and service providers with the industry's most robust and feature-rich VoIP; video telephony and instant messaging API. SIP & XMPP Compliant.
eyeP Media S.A. - A SIP SDK
HCL Technologies - SIGCOMP ; Robust Header Compression (RoHC)and DIAMETER Protocol tool kits for SIP based product integration and applictaion development in VoIP/IMS. Runs on Linux OS
Hellosoft - An API which can be used to develop various SIP based applications.
Hughes Software Systems - Full SIP Stack/SIP Lite.
Iagu Networks - Slipper is software that provides the call-processing component of IP Telephony Solutions using SIP.
Intel® - NetStructure(TM) IPT1200C, IPT2400C, IPT4800C, and IPT6720C IP Boards
Inventive Labs - Voice Elements is a .NET that works with the new HMP Elements SIP stack.
ipGen - SIP stack (UA)
LanScape Corporation - The VOIP Media Engine™; A complete drop in call engine for all Windows® applications requiring SIP/RTP telephony capabilities. Supports G729/G729A; iLBC (20Ms and 30Ms); uLaw; aLaw and 3 PCM codecs.
Mediatrix - Mediatrix SIP stack
Microsoft - The Microsoft® Office Live Communications Server 2003 API suite allows developers to create custom Session Initiation Protocol (SIP) applications and manage the Microsoft Office Live Communications Server 2003 product.
MIP Telecom - Development tool kit for UA applications
Mistral Software - MistSIP - a customizable, high performance stack for Linux/Windows.
Nine-9s - SIP protocol stack, RTP/RTCP stack, voice codecs, video codecs, voice quality monitoring software
Netbricks - SIP-BRICKS: a field-proven high-performance SIP implementation.
Netergy Microelectronics - Veracity VoIP Software Stacks
Packetway, Inc. - SIP Toolkit and Solutions based on it
Parrish Systems - EmSIP is an embedded SIP Stack (RFC3261 Compliant),
designed for IP phones, multimedia terminal adaptors (MTA) and routers. It's entirely coded in ANSI C.
PJSIP - PJSIP is an Open Source; high quality; small footprint; high performance; and ultra portable SIP stack written in C.
PointerCom S.p.A. - MjSip is a complete java-based implementation of a SIP stack. MjSip is available open source under the GPL license.
PortSIP Solutions; Inc. - PortSIP offers several Software Development Kits (SDKs). These SDKs allow developers and Service Provider; OEM or Enterprise clients to create customized SIP-based VoIP applications.
Pronexus Inc. - VBVoice is a service creation environment, embedded in VS.NET. Create SIP-based IP telephony communications solutions through a visual interface!
Rocksteady Networks, Inc. - Rocksteady Network Sharing Application (RocksteadyNSA(TM)) equips broadband service providers with smarter ways to deliver a superior data service offering, QoS for VoIP deployment and business-critical managed services. SIP Proxy support.
SandCherry - SIP control interface and a management agent
Juphoon System Software - Sip protocol stack support rfc3261; 3262; 3263; 3265... etc. Stack is written by ANSI C; with only 30000 lines(no comment and space). We provide high performance and reliable sip.
Smart Yantra - SIP Software stack
Sunshine Mind Inc - Low cost VoIP gateways ( from one FXO/FXS port to multiple T1 configurations); Trunking gateways; and SIP phones
SX Design - VoIP Solution for IP2022 Microcontroller
T!Semantics - Multi-protocol free stack
Telchemy - Embedded voice quality monitoring agent, supporting RTCP XR and other QoS reporting protocols.
Trinity Convergence - VeriCall Edge™ is a complete and integrated VoIP embedded software platform offering the media processing; and SIP call control functionality required to build a video and VoIP enabled client device.
Unicoi Systems, Inc. - The Fusion Session Initiation Protocol (SIP) software suite is at the heart of Unicoi's Voice over Intenet Packet (VoIP) offerings. Fusion SIP is a lightweight, transport-independent, text-based protocol designed for usage in IP Phones, VoIP Gateways, and other telephony enabled IP products
Voxeo IVR - Voxeo VoiceCenter is a comprehensive, SIP / VOIP telephony development platform including full support for CCXML, CallXML and ENUM.
Welltecch Computer Company Ldt. - Welltech SIPivr 6800 provides a SIP-based VoIP Interactive Voice Processing (IVR) developing system that help to create profitable value added service quickly and easily
Wipro - SIP Stack
Wind River - Wind River's high performance SIP Protocol stack is provided as C source code, supporting User Agent and Proxy/Redirect server applications
Works Out Software; Inc. - The inTEL(IP)hone SDK is powerful yet easy-to-use API which enables developers to leverage SIP / RTP based VoIP in .NET applications. Features a full range of codecs and audio capabilies.