List of SIP software

This list of SIP software documents notable software applications which use Session Initiation Protocol (SIP) as a voice over IP (VoIP) protocol.

Free and open-source license
A SIP server, also known as a SIP proxy, manages all SIP calls within a network and takes responsibility for receiving requests from user agents for the purpose of placing and terminating calls.
 * Asterisk
 * ejabberd
 * FreeSWITCH
 * GNU SIP Witch
 * Kamailio, formerly OpenSER
 * Mobicents Platform (JSLEE[2] 1.0 compliant and SIP Servlets 1.1 compliant application server)
 * OpenSIPS, fork of OpenSER
 * SailFin
 * SIP Express Router (SER)
 * Enterprise Communications System sipXecs
 * Yate

Proprietary license

 * 3Com VCX IP telephony module: back-to-back user agent SIP PBX
 * 3CX Phone System, for Windows, Debian 8 GNU/Linux
 * Aastra 5000, 800, MX-ONE
 * Alcatel-Lucent 5060 IP Call server
 * Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client
 * AskoziaPBX
 * Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP
 * Bicom Systems IP PBX for telecoms
 * Brekeke PBX, SIP PBX for service providers and enterprises
 * Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM)
 * CommuniGate Pro, virtualized PBX for IP Centrex hosting, voicemail services, self-care, ...
 * Comverse Technology softswitch, media applications, SIP registrars
 * Creacode SIP Application Server Real-time SIP call controller and IVR product for carrier-class VoIP networks
 * Dialogic Corporation Powermedia Media Servers, audio and video SIP IVR, media and conferencing servers for Enterprise and Carriers.
 * Dialexia VoIP Softswitches, IP PBX for medium and enterprise organizations, billing servers.
 * IBM WebSphere Application Server - Converged HTTP and SIP container JEE Application Server
 * Interactive Intelligence Windows-based IP PBX for small, medium and enterprise organizations
 * Kerio Operator, IP PBX for small and medium enterprises
 * Microsoft Lync Server 2010 & 2013
 * Mitel Communications Director
 * NEC SV7000 back-to-back user agent SIP PBX
 * NEC UNIVERGE 3C Unified Communications and Collaboration software
 * Nokia Siemens Networks hiQ8000
 * Nortel SCS500
 * Nortel SIP Multimedia Communication Server 5200
 * Objectworld UC Server
 * Oracle Communications Converged Application Server (OCCAS)
 * Oracle WebLogic SIP Server
 * Spirent SIP Server Platform
 * ShoreTel IP phone systems with unified communications and contact center built in
 * Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP)
 * Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter.
 * Sterlite Technologies Neox IPPBX, IMS - ISC, Dial Center - OmniChannel Call Center, IVR products
 * Sun Microsystems Sun GlassFish Communication Server
 * Tadiran Telecom Coral Ipx family and Aeonix softswitch
 * Tandberg Video Communication Server - SIP application server, media server and H.323 gateway
 * Unify OpenScape Voice, OpenScape 8000 SIP softswitch, mediaserver, ... (SIP)
 * Voice Elements Inventive Labs' .NET Voice Development software and SIP stack platform.
 * Zultys MX250/MX30 IP PBXs for SMB and enterprise

Free and open-source license

 * Ekiga (formerly known as GnomeMeeting). SoftPhone, Video Conferencing and Instant Messenger. No longer maintained, but still available.
 * Jami, with GTK/Qt GUI, also supports IAX2 protocol, for Linux, OS X, Windows GPL
 * Jitsi, a Java VoIP and Instant Messaging client with ZRTP encryption, for FreeBSD, Linux, OS X, Windows; LGPL
 * Linphone, with a core/UI separation, the GUI is using Qt libraries, for Linux, OS X, Windows, and mobile phones (Android, iPhone, Windows Phone, BlackBerry)
 * MicroSIP, lightweight softphone, using PJSIP stack, for Windows
 * Telephone, OS X softphone written in Cocoa/Swift
 * Twinkle, using Qt libraries, GPL, for Linux
 * Yate client, using Qt libraries, GPL

Proprietary license

 * Blink, for Mac
 * Librestream's 2500 Camera, 5000HD camera, Onsight Cube (wearable/modular camera), Onsight Connect (Windows, iOS, Android).
 * LifeSize Desktop, for Windows
 * Phoner and PhonerLite, for Windows, Voice: G.711, G.722, G.726, GSM, iLBC, Speex, Opus; security: TLS, SRTP, ZRTP
 * Polycom PVX, for Windows. Voice: G.711, G.722, G.722.1, G.728, G.729A, Siren Codec; Video: H.261, H.263, H.264; Data: T.120, People+ Content, H.239, H.323 Annex Q far-end camera control

Discontinued

 * QuteCom, formerly named OpenWengo, using Qt libraries, GPL, for Windows, Mac, and RPM- DEB-based Linux, discontinued in 2016
 * Gizmo5, formerly PhoneGaim, discontinued in 2011
 * Empathy, using GTK libraries and Telepathy framework, GPL, discontinued in earliest visible, 2021.
 * Windows Messenger versions 4 and 5 (not to be confused with Windows Live Messenger or MSN Messenger which do not support SIP)

Free and open-source license

 * Jami for Android, iOS; GPL v3
 * Linphone for Android, BlackBerry, iPhone, Windows phone; GPL v2
 * Sipdroid for Android, GPL v3

Proprietary license

 * Acrobits for iOS and Android

Session border controllers

 * Acme Packet Session Director
 * Audiocodes Mediant
 * Genband Quantix SBC
 * Ingate Systems Ingate SIParators
 * Metaswitch Perimeta
 * Kamailio

Enabled firewalls

 * Check Point VPN-1 firewalls, include complete SIP support for multiple vendors
 * The firewall feature in Cisco IOS includes complete SIP support
 * Cisco PIX/ASA firewalls include complete SIP support
 * D-Link Firewall DFL-210/260/800/860/1600/2500 supports SIP (SIP-ALG) with firmware 2.20.01.05 and above
 * Fortinet, all FortiGates running v280/v300 builds
 * Intertex SIP transparent routers, firewalls and ADSL modems, for broadband deployments and SOHO market
 * Juniper Networks Netscreen and SRX firewalls include complete SIP Application Layer Gateway support
 * Linux Netfilter's SIP conntrack helper fully understands SIP and can classify (for QOS) and NAT all related traffic
 * Netopia Netopia supports ALG
 * PF, built-in OpenBSD firewall PF can handle the NAT through the "static-port" directive and the bandwidth control through the built-in queuing system of SIP connections
 * pfSense, a firewall/router distribution based on FreeBSD and PF; has QoS that properly tags VoIP traffic and a SIP proxy package that is available for NATed endpoints. Its functionality can be expanded with packages like FreeSWITCH, a free/open source software communications platform for making SIP, voice and chat driven products.
 * Secure Computing, SnapGear firewall includes siproxd SIP proxy, Sidewinder 7 firewall includes a SIP proxy
 * SonicWall, supports SIP
 * ZyXEL ZyWALL P1, 2Plus, 5 UTM, 35 UTM, 70 UTM, 1050, USG 100, USG 200, USG 300, USG 1000 supports SIP-ALG

Libraries

 * oSIP

Test tools

 * Codenomicon Defensics: commercial test automation framework
 * Ixia (company) commercial SIP-VoIP and Video test and emulation and load test platform
 * Mu Dynamics: commercial SIP-VoIP, RTSP-IPTV Triple Play service assurance platform