SIP Servers
3Com® VCX (TM) V7200 IP Telephony Call Controller
Performs signalling, call treatment, and back office functionality. The powerful, high-availability call controller offers redundancy and fail-over mechanisms that ensure carrier-class reliability. Operates with the 3Com VCX V7000 IP Telephony Solution. Visit 3Com's SIP Showcase >>>
Acme Packet - Net-Net Session Router and Net-Net Session Director
AlbaSoft - AlbaTalk PC to PC Call and More Chat SIP:albatalk.com
Anyuser.Net - SIP call agents, a SIP gateway and a SIP interface with H.323
Arelnet - SIPrime- Carrier Class gateway enables fully integration with SIP based networks.
Avaya SIP Enablement Services: SIP Enablement Services (SES) is a software suite of SIP-based services designed to run on the Avaya S8500 Media Server. SES creates a communication services layer within the Avaya Communications Architecture that mediates between Avaya MultiVantageTM Communication Applications and a wide range of standards-based user agents, web-based applications, and communication devices. SES combines the standard functions of a SIP proxy/registrar server with SIP trunking support and duplicated server features to create a highly scalable, highly reliable SIP communications network supporting telephony, instant messaging, conferencing, and collaboration applications.
For more information on SIP Enablement Services, click here:
Avaya SIP Application Service (SIP A/S): The Avaya SIP Application Server is both a carrier-class deployment platform and a programmable, standards-based application creation environment (ACE) that allows providers to develop and deploy next-generation converged communications services. Use of the Avaya SIP Application Server is extended through the open, standards-based SIP Servlet application programming interface (API). By offering a range of pre-built Application Building Blocks (ABBs) and their non-SIP based connectors (ABB-C's), programmers can employ familiar tools to quickly develop real-time communications applications without detailed knowledge of SIP or underlying telecom network infrastructure. Learn more at Avaya,.com >>>
BaseVoice; LLC - SIP Stack implementation of the JAIN SIP API v1.1 and a J2EE-based SIP Server that functions as a Proxy; Registrar and Presence Server.
BCM Communication Co.; Ltd. - SIP WLAN mobile IP phone; SIP IP phone
Beyazpinar Computaciones and Software - Seller of SIP Solutions for IP Telephony.
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.
BrainHive Technologies - SIP IVRs; SIP Softswitches and SIP Conferencing solutions
Brekeke Software - Brekeke SIP Server provides reliable and scalable SIP communication platform. Advanced Edition provides features & performance for carrier-class/enterprise deployments. Free for personal and academic.
Carnegie Mellon University - Community server with presence
Cisco's SIP Proxy Server, Cisco SIP phones and Integrated Access devices deliver feature rich, scalable voice and data services to small businesses, small multiple dwelling units and similar applications.
CMS computers Limited - SIP server and SIP client devices
Columbia University Computer Science - Sipconf conferencing software. Complete sipd with interaction with other Unix utilities
CommuniGate Pro(TM) messaging & SIP server. Functionality: standards-based SMTP, POP, IMAP, LDAP & Webmail, integrated calendaring (support for Outlook), IM, VoIP/Video, desktop & application sharing.
Continuous Computing - Continuous Computing offers Trillium SIP Servers (Proxy; Registrar; Redirect Server). These offerings are compliant with industry standards; offer extensive APIs; and operate on all major OSs.
Creacode - NicSC SIP Session Controller is high performance and flexible SIP Call Controller, Registrar and NAT Traversal solution. Easy integration with an external Radius, HTTP based billing server or an ODBC compliant Database.
CTL Inc. - Delivering SIP Integration Solutions for IP Telephony.
Dialexia Communications - Dial-Gate® with IP-Tone® services is a Web-based SIP proxy and a centralized routing server for both the VoIP & PSTN networks.
Doretel Communications, Inc. - Doretel’s SIP Proxy Server has been designed to entitle Service Providers with an allinone Management Tool for all their varied IP Telephony Services.
E-Resource 21 Pte Ltd - YesTalkTM SIP server; coupled with third party VoIP Gateways; represents a full-featured system allowing for establishing; processing; monitoring; billing.
eDial - SIP-based hardware appliance for call control and management from any device.
EnGenius Technologies - EnGenius EnQue VOICE OVER IP SOLUTION. We have a line of low cost high feature SIP server and client devices. Including a WiFi phone; Desk Phone; SMB SIP servers; Modular Enterprise SIP servers.
Enter-Service - Ukranian SIP provider. Full SIP service - VOIP service; Free Web Calls; Free PC-to-PC sip service; Prepaid PSTN service
eStara - SIP Proxy service
Eyeball Networks - Eyeball Any-Firewall Server provides a scalable NAT and firewall traversal solution for SIP end-points based on IETF standards and drafts such as STUN; TURN and ICE. 100% Call Completion.
Funkwerk Enterprise Communications - Hybrid PBX with SIP gateway; analog trunk lines and ISDN trunks. Works as SIP proxy for VoIP extensions as well. elmeg ICT series
HCL Technologies Ltd - SIP Reusable components - UA & Server
HP delivers more of what network, service and content providers demand - an adaptive enterprise that efficiently deploys personalized, content-rich services to drive profitable revenue. HP is a technology solutions provider to consumers, businesses and institutions globally. The company's offerings span IT infrastructure, personal computing and access devices, global services and imaging and printing for consumers, enterprises and small and medium businesses. For the last four quarters, HP revenue totaled $71.3 billion.
More information about the HP network and service providers industry vertical is available at www.hp.com/go/nsp. More information about HP is available at www.hp.com
Hughes Software Systems - 3261 compliant customizable SIP Server.
I Culture Commmunication Inc. - COMFiNiX Server; a full-featured SIP Server
IEC - SSP is a VXML 2.0; SIP 2.0 compatible IVR platform. It integrates OpenVXI with MRCP server; but also provides prompts/DTMF based IVR on its own. It also includes a conferencing engine.
Intel - Intel® NetStructure(TM) Host Media Processing Software. This software enables customers to build full-featured, scalable, and cost-effective software-only IP media servers for interactive voice response (IVR), voice mail, unified messaging, and conferencing.
Interaction SIP Proxy by Interactive Intelligence enables organizations to intelligently route SIP-based messages over IP networks, thus extending the benefit of converged communications architectures for the distributed enterprise.
The product's routing capabilities include automatically sending calls to alternate routes when primary or secondary routes fail, and sending calls to different routes determined by the number or address dialed and pre-configured dial plans. Visit Interactive Intelligence's SIP showcase >>>
Intertex Data AB 
Built-in SIP server and optional SIP Switch for PBX-like features in the Internet Gate SIP aware firewall. FXS/FXO ports; WLAN; ADSL; VPN termination and more..
IVR Technologies, Inc. - Enhanced services and integrated billing for SIP based networks.
Iwatsu Electric - NetSpeak is a SIP-based communications platform consisting of a VoIP SIP call control server, SIP key telephones, PSTN gateways and wireless handsets that provide superior IP voice quality using echo-canceling technology patented by Iwatsu.
Juphoon System Software - Provide excellent sip protocol stack; which written by ANSI C(30000 lines); sip stack support rfc 3261; 3262; 3263; 3265. etc. We provide high performance and reliable stack.
LanScape Corporation - LanScape's Centrex Proxy™ Server is a full featured scalable VOICE and VIDEO SIP proxy that will allow you to overcome all session and media NAT related issues. All Windows OS's supported. Much more.
LignUp Corporation - LignUp provides a 100% software converged communications platform deployed with a SIP server and voice mail unified messaging; auto attendant and partner turnkey applications.
M5T - M5T SIP-Proxy SAFE is an RFC 3261 based C++ framework for building advanced SIP servers such as core and edge proxies; application server; registrar and redirect servers.
Mailvision - SIP platform for unified messaging
Maple Leaf Communications - The MLC SIP Server provides enhanced call control for VOIP networks which are Session Initiation Protocol (SIP) based.
Mediatrix - The IP Communication Server
Meetinghouse Data Communications - SIP proxy server
Micronet Communication Inc - SP5210 VoIP Communication Server, a SIP-compliant proxy server.
Microsoft - Live Communications Server 2005 is built using industry-standard protocols Session Initiation Protocol (SIP) and SIP Instant Messaging and Presence Leveraging Extensions (SIMPLE), enabling a broad partner and developer ecosystem.
MIP Telecom
Mistral Software SIP Proxy Server
Mockingbird Networks - MPS/SIP MultiProtocol Server
Nadiz Int. Inv. Inc. - MaxiSIP - Free SIP service; free International SIP registrar powered by Nadiz Int. Inv. Inc.
Naturalvoice.us - Portuguese and English Free SIP provider located in New York - EUA
NEC - SV7000 full-featured telephony server. The SIP-enabled, client server configuration supports the broadest range of telephones in the market.
NGC Systems Sdn Bhd - Genico™ PowerBase; a Carrier-grade SIP server; supports RFC3261; with easy interface to POTS; mobile & 3G networks. Integration with services like IPCentrex; VoiceMail; VoiceVPN; IVR; voice portals...
nippon computer - sip server
Nokia Research - Nokia All-IP Mobility Core
Multimedia Communication Server 5100
The Nortel Networks Multimedia Communication Server (MCS) 5100 is a multimedia communications and collaboration applications delivery solution for Enterprises that seamlessly delivers converged multimedia services to employees regardless of their work location. The MCS 5100 drives VoIP networks, delivering multimedia and collaborative applications to the enterprise on an "open" platform that supports industry-standard protocols, including SIP and H.323. More >>>
Multimedia Communication Server 5200
The Nortel Networks Multimedia Communication Server 5200—which seamlessly integrates voice with video, collaboration, and presence services—enables service providers to deliver hosted multimedia communications services to create new revenue-generating opportunities. These Session Initiation Protocol-based (SIP), next generation, multimedia services enhance the ability for both enterprise and consumer end-users to communicate and collaborate more effectively and efficiently. More >>>
My SIP Switch - SIP Switch is an online call management application; enabling you to use multiple SIP providers services from one piece of hardware and to manage all your calls on the fly: hang up; transfer; forward
Object Software - Redirect server
Objectworld Communications - Objectworld's UC Server; a UM & UC server for SME/SMB; simple deployment with wizard-based Windows installation. Fully SIP compliant. Video & Audio Conferencing. Active Directory; Exchange support.
OKSiJEN - SIP Proxy
OpenSIPStack - Open Source (MPL 1.0) Session Border Controller and SIP Registrar. Fully functional reference implementation of the OpenSIPStack library.
OpenXg - OpenSIPg is a full-blown SIP platform for service providers. Including the best from the open source world; integrating them with a powerful provisioning system. Comes with high performance pre-config
Reduced time to market by adopting proven IT standards such as SOA and J2EE Web Services Out of the box revenue generating services such as VoIP calling and host based telephony systems Comprehensive, end-to-end solution links into strategic back-end systems such as CRM, ERP, billing and service provisioning Hot Pluggable standards based architecture that works with third party and legacy components, as well as Oracle components. Further information >>>
Oz.com - iPulse(TM)
Packetway, Inc. - TRiDENT - SIP Server based on Packetway's SIP/SDP/RTP/RTCP Stack
Polypix - AP5000 - Advanced SIP Proxy
PortaOne - VoIP Billing Solutions
Predictive Financial Technologies SIP-based Presence server solution
QuesCom - NextBX(r) Access Call Server
RadiSys Corp - AdvancedTCA(R) based SIP server
RADVISION SIP Server Platform
The RADVISION SIP Server Platform is a comprehensive framework for the development of any type of SIP Server application including Proxies, Registrars, Redirect Servers, Back-To-Back User Agents (B2BUA) and SIP Events Server (including Presence and Winfo). The SIP Server Platform includes an implementation of fully-standard server functionality that is controllable through multi-level APIs. SIP Server developers can easily and seamlessly integrate the SIP Server Platform into their application and customize it according to project needs, thus adding SIP Server capabilities to their implementation quickly and effectively. Visit RADVISION's SIP Showcase >>>
Raviant Networks - Preform(TM) Data Engine
Ridgeway Systems and Software - Firewall Tunnelling Proxy
Servonic - SIP-based SoftPBX (Proxy) Server
Sleipner - comedia RealTime: carrier grade SIP Proxy server
SNOM Technology SIP Registrar Proxy For VoIP In SMBs
Sun Microsystems
Syndeo - Broadband Services System
SysMaster Corporation - VoIP Billing for SIP calls.
T3 Telecom Software; Inc. - Next-generation SIP-based unified messaging solutions including voice mail; speech recognition; text-to-speech; voice biometrics; interactive voice response; fax and automated attendant functionality.
Tekelec - SIP Server
TekSIP - SIP Registrar/Proxy fro Windows
Terminal Technologies - Atrium J2EE SIP Server
Transnexus - OSP Nexus (TM) Server
Trillium - Trillium SIP Stack
Ulticom Signalware® provides an integrated signaling platform to enable the development of carrier-grade SIP network elements. Signalware supports the development of SIP proxy, registrar, and redirect servers in addition to any IMS network element such as CSCF, SIP application servers, IM-SSF, and SIP presence servers. Visit Ulticom’s SIP Showcase >>>
Voice System SRL - Complete SIP VoIP platform (SIP server/proxy/registrar; NAT traversal; provisioning; media server)
VozTelecom - WeSIP is an IMS compliant application server; which offers an open architecture with the main industry's Java-based APIs (SIPservlet) to enable the rapid creation of converged applicatons and services.
X&Y Communication Tech. Co.,Ltd - The X&YComm SIPSP is a SIP-based call-control software package that enables small and medium enterprises and service providers to build scalable next generation VOIP networks with lower costs and better service.
Zultys Technologies - MX250: SIP Server with application layer gateway, Voicemail, ACD, Gateway, Auto Attendant, Presence, Instant Messaging, Unified Messaging.
Zygox Inc - SIP Servers - Proxy, Redirect & Registrar.