Comparison of VoIP software

Comparison of VoIP software

VoIP software is used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. VoIP stands for "Voice over IP". For residential markets, VoIP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g. have a New York PSTN phone number in Tokyo.

For businesses, VoIP obviates separate voice and data pipelines, channelling both types of traffic through the IP network while giving the telephony user a range of advanced capabilities.

Softphones are client devices for making and receiving voice and video calls over the IP network with the standard functionality of most "original" telephones and usually allow integration with IP phones and USB phones instead of utilizing a computer's microphone and speakers (or headset). Most softphone clients run on the open Session Initiation Protocol (SIP) supporting various codecs. Skype runs on a closed proprietary network, though the network (but not the official Skype client software) also supports SIP clients.[1] Online "Chat" programs now also incorporate voice and video communications.

Other VoIP software applications include conferencing servers, intercom systems, virtual FXOs and adapted telephony software which concurrently support VoIP and PSTN like IVR systems, dial in dictation, on hold and call recording servers.

Contents

General softphone clients

Program Operating systems License Open Source? Protocols/based upon/compatible with Encryption Max conference peers Other capabilities Latest release
AOL Instant Messenger Mac OS, Windows Freeware / Closed Proprietary No SIP (Windows ver. only), RTP Unknown Unknown Video, file transfer, PC to phone, phone to PC
Avaya Application Server 5300 Soft Client Windows Proprietary No SIP, RTP, TLS, SRTP Unknown 2.0 (2010)
Blink Linux, Mac OS, Windows GPL / Free software Yes ICE, SIP, MSRP, RFB (VNC) TLS, SRTP Unlimited IM, File Transfer, Desktop Sharing, Multi-party conference, Wideband 0.23.2 (February 15, 2011)
Bria by CounterPath Corporation Windows, Mac OS, Linux (Voice calling only) Proprietary No SIP, XMPP, STUN, ICE TLS, SRTP 6 party audio; 3 party video Voice and HD (1280 x 720p) Video calling; IM and Presence (SIP SIMPLE and XMPP); Multiple Account Integration; Address Book Support (Mac and Windows); Company Chat Rooms; USB Support; Troubleshooting Assistant; Workgroups; Call Recording and Conferencing 3.2 (April 2011)
Brosix Linux, Mac OS, Windows Freeware / Closed Proprietary No Yes Unknown Text chat, File transfer, Video chat, Screen-shot, Screen-sharing, Whiteboard, Co-browse 3.0 (July 2010)
Cisco IP Communicator Windows Closed Proprietary No SCCP (Skinny), SIP, TFTP sRTP Unknown Call Recording, Silent Monitoring, Multiple lines and directory numbers, Configurable speed dial, Calling name and number display, Call Waiting, Call Forward, Call Transfer, Three-Way Calling (conference), Call Park, Call Pickup, Redial, Hold, Barge, Callback, Extension Mobility, Message waiting indicator, iDivert, Meet Me conferencing, Group Pickup, Do Not Disturb,G.722 wideband, G.711a, G.711u, iLBC, G.729a, and G.729ab audio codecs 7.0.6 (Jan 2011)
Ekiga Linux, (Beta Windows support), OpenSolaris GPL / Free software Yes SIP, H.323, H.263, H.264/MPEG-4 AVC, STUN, Theora, Zeroconf No Unknown Video, IM, LDAP, Call Forwarding, Call Transfer 3.2.7  (May 31, 2010)
Empathy Linux GPL / Free software Yes SIP, XMPP (Jingle), ICE (STUN/TURN), Zeroconf No Unknown IM, multi-user A/V[citation needed], collaborative applications 2.32.0.1 (2010-10-04)
Eyeball Chat Windows Freeware / Closed Proprietary No SIP, STUN, ICE, XMPP Yes 5[2] IM, Conferencing, Voice, Video and SIMPLE based presence Windows 3.2
eyeBeam by CounterPath Corporation Windows Proprietary No SIP TLS, SRTP 6 party audio; 3 party video Voice and Video calling; IM and Presence (SIP SIMPLE); Import Microsoft Outlook Contacts; USB Support; Call Recording and Conferencing 1.5.20.1 (March 2010)
Gizmo5 Linux, Mac OS X, Windows, Windows Mobile Phone, Blackberry, Nokia, PDA Java Freeware / Closed Proprietary No SIP, XMPP SRTP Unknown Record Calls, Forward Calls, MSN IM, Windows Live Talk, Google Talk, Talk with Yahoo, Messenger, XMPP Windows: 4.0.5.395 (23 Sep 2009), Mac OS: 4.0.0.269 (23 Sep 2009)
Google Talk Linux, Windows Closed Proprietary (using libjingle) No XMPP zRTP Unknown Video, chat, file transfer, voicemail, mail via "GMail Integration" 1.0.0.104
IBM Sametime Linux, Mac OS X, Windows, mobile Closed Proprietary No SIP, SIMPLE, T.120 and H.323 TLS Unknown IM, File transfer, Voice, Presence, Server stored contact list, HTTP tunneling, plugins, embedable in Lotus Notes[3] 8.5.2 (08. May 2011)
iChat Mac OS X Closed Proprietary No SIP AIM ICQ XMPP H263 H264 Unknown Unknown Integrated, PBX independent January 2007
Jitsi Linux, Mac OS, Windows XP/2000 (all java supported) LGPL / Free software Yes SIP/SIMPLE, XMPP Voice encryption (SRTP and negotiation with zRTP), Signaling encryption (TLS) Unknown Text messaging, audio/video telephony, IPv6, call recording updated daily  (December 26, 2010; 10 months ago (2010-12-26))
KPhone Linux (KDE) GPL / Free software Yes SIP, STUN, NAPTR/SRV SRTP Unknown Video, voice, IM, external Sessions, IPv6 support for UDP 1.2 (November 2008)
Linphone Linux, Windows, Android, iPhone, BlackBerry GPL / Free software Yes SIP No Unknown Video, IM, STUN, IPv6 3.4.1 (Feb 2011)
MicroSIP Windows GPL / Free software Yes SIP, STUN, ICE, SIMPLE TLS, SRTP Unknown Voice, IM and Presence 1.8.0 (September 2011)
Mirial Softphone (Mirial s.u.r.l.) Windows 2000/XP/2003/Vista/7 (including 64bit versions), Mac OS X (x86) Closed Proprietary No SIP, H.323, RTSP DTLS-SRTP Unknown H.264 Full-HD 1080p video rx/tx, Two independent lines supporting Call Control and 3-Party videoconference in Continuous Presence, G.722.1/C wideband audio, Call recording/export, DV/HDMI/Component capture, Presentation (H.239, RFC-4796), Encryption, Far End Camera Control, GPU accel (D3D and OpenGL) 7.0.24 (May 26, 2010)
Mumble Linux, Mac OS X, Windows, Android BSD Yes CELT / Speex TLS and OCB-AES128 No max (limited only by server bandwidth and memory) Chat with (limited) embedded HTML, Automatic Gain Control, Access Control Lists for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels, Echo cancellation, Logitech G15 support 1.2.3 (February 19, 2011)
PhonerLite Windows Freeware / Closed Proprietary No SIP TLS, SRTP, ZRTP 8 Conferencing, call redirection, call recording 1.93  (November 1, 2011; 20 days ago (2011-11-01))
QuteCom Linux, Mac OS X, Windows XP/2000 GPL / Free software Yes SIP SRTP, but key exchange via Everbee key Exchange which is not a Standard) Unknown Video, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), voicemail, wengo to phone, conferencing. 2.2.1  (June 22, 2011; 4 months ago (2011-06-22)[4])
Revation Communicator Windows 2000/XP/Vista/7 Closed Proprietary No SIP/SIMPLE TLS and SRTP No max (limited by server mixing services) Secure Multi-Party Chat/Instant Messaging, Presence, VoIP, Video, File Transfer, Desktop Sharing 5.3 (August 2011)
SFLphone Linux GPL3 / Free software Yes SIP, RTP, IAX2, STUN per account, SRV Voice encryption (SRTP), Signaling encryption (TLS), Multiple realms authentification mechanism Unknown Gnome/KDE client, address book, multiple accounts, unlimited number of calls, call transfer, call hold/unhold, call recording, Multi-way conferencing 0.9.13 (April 5, 2011)
SightSpeed Mac OS X, Windows Freeware / Closed Proprietary No SIP, RTP,Proprietary P2P protocol Unknown Unknown Video, voicemail, phone in, phone out, multiparty calling, conference recording, text messaging, NAT traversal, video mail 6.0
Skype Linux, Mac OS X, Windows 2000/XP/Vista/7/Mobile (no longer supported), BREW, Android, iPhone, PSP Freeware / Closed Proprietary No Proprietary P2P protocol; SIP users can connect to the Skype network using alternate software/hardware, but the Skype software does not support it directly[1] Yes 25 starting with version 3.6.0.216. 10 with 2.x Conferencing, video, file transfer, voicemail, Skype to phone, phone to Skype, additional P2P extensions (games, whiteboard, etc...); depending on platform.

5.6.0.110 (Windows) [5]  (October 13, 2011; 39 days ago (2011-10-13))
5.3.0.1093 (Mac OS X)  (September 1, 2011; 2 months ago (2011-09-01))
3.5.454 (iOS)  (November 17, 2011; 4 days ago (2011-11-17))
2.2.0.35 (Linux)  (June 2, 2011; 5 months ago (2011-06-02))
2.5.0.160 (Android)  (October 21, 2011; 31 days ago (2011-10-21))
Spikko Windows 2000/XP/Vista/7/Mobile , iPhone, Freeware / Closed Proprietary No SIP Yes 8 Conferencing, voicemail, PC to phone, phone to PC, Free international phone numbers, address book integration; Dec 2010
TeamSpeak Linux, Windows, Mac OS X, FreeBSD, Android, iOS Freeware Closed / Proprietary No CELT / Speex Yes (Optional) Unlimited (depending on server bandwidth and memory) Simultaneous Server Conferencing with Tabs, 3D Sound Effects, Scalable Permissions System, Firewall Friendly File Transfers, In-Game Overlay for DirectX & OpenGL Games, Global Public Server List, Plugin System 3.0.1
Telephone Mac OS X 10.5 BSD / Free Software Yes SIP, STUN, ICE No Unknown Address Book integration 1.0.2 (April 30, 2011; 6 months ago (2011-04-30))
Tokbox Mac OS X, Windows XP/2000/Vista Freeware / Closed Proprietary No Unknown Unknown Unknown Video calling, video conferencing, chat, IM (MSN, AIM, Yahoo!, Google Talk) Unknown
Toktumi Unlimited / Line2 Pro Windows XP/Vista/7, Mac OS X, iOS, Android Freeware / Closed Proprietary No Proprietary with SIP core Unknown 20 Conferencing, voicemail, caller ID, call-waiting, address book integration; auto-attendant, call-forwarding Windows: August 2010 / OS X: October 2010
Tru App Windows 2000/XP/Vista/7, Mac OS X, Linux
iOS, Android, Symbian, BlackBerry OS,		 Freeware / Closed Proprietary No SIP, XMPP Unknown Unknown Chat, file transfer, voicemail, inbound numbers, integration with GTalk, Microsoft Live, Skype
Twinkle Linux GPL / Free software Yes SIP SRTP, ZRTP Unknown Conferencing, chat, file transfer, Firefox integration, call redirection, voicemail, support of VoIP-to-Phone services 1.4.2  (2009-02-25)
Vbuzzer Windows 2000/XP/Vista Freeware / Closed Proprietary No SIP TLS Unknown IM (MSN), voicemail, personalized voice greeting. 2.0.282
Ventrilo Mac OS X, Windows Freeware / Closed Proprietary No No Unknown Conferencing, chat, text-to-speech 3.0.8
Voice Operator Panel Windows 2000/XP/Vista Closed Proprietary No SIP, RTP Unknown Unknown Call forwarding, Call transfer, Call recording, Presence, Outlook integration, Windows Messenger/MSN/Live integration, CRM, Built-in web browser & e-mailer, LDAP, APS. 1.3.2
X-Lite Mac OS, Windows, (Linux) Freeware / Closed Proprietary No SIP, STUN, ICE No Unknown IM, single login account, for Windows and Mac also Conferencing, Video and SIMPLE based presence Windows / Mac OS: 4.1 / Linux: Discontinued
Yahoo! Messenger Mac OS (8, 9, X), Windows, (Linux/FreeBSD version not VoIP capable) Freeware / Closed Proprietary No SIP (using TLS) and RTP (media) Unknown Unknown Video, file transfer, PC to phone, phone to PC
Zfone Linux, Mac OS X, Windows Freeware / Viewable source Proprietary (includes time bomb provision) No SIP, RTP SRTP, ZRTP Unknown Beta 2008-09-04 (Linux 0.9.224), (Mac OS 0.9.246), (Windows 0.9.206)

Mobile phones

Program Operating systems License Protocols/based upon/compatible with Encryption Other capabilities Latest release
Bria Android Edition by CounterPath Corporation Android v2.1 or later Proprietary SIP TLS, SRTP VoIP over Wi-Fi or 3G with data plan; Audio codecs G.711, G.722, iLBC and GSM, option to purchase G.729; Call display and voicemail indicator; Speakerphone, mute and hold; Three-way audio conference; Ringtones and contact avatars 1.1.6 (August 2011)
Bria iPad Edition by CounterPath Corporation iPad or iPad 2 running iOS v4.3+ Proprietary SIP TLS, SRTP VoIP over Wi-Fi or 3G with data plan; Audio codecs G.711, G.722, iLBC and GSM, option to purchase G.729; Call display and voicemail indicator; Call history; Speakerphone, mute and hold; Three-way audio conference; Ringtones and contact avatars 1.0.1 (July 2011)
Bria iPhone Edition by CounterPath Corporation iPhone 3GS or 4 running iOS v4.0+, iPod touch 3rd Generation+, iPad compatible Proprietary SIP TLS, SRTP VoIP over Wi-Fi or 3G with data plan; Audio codecs G.711, G.722, iLBC and GSM, option to purchase G.729; Call display and voicemail indicator; Call history; Speakerphone, mute and hold; Three-way audio conference; Ringtones and contact avatars. Option to purchase Instant Messaging (IM) and Presence add-on. 1.1.3 (August 2011)
Gizmo5 Mobile Windows Mobile (non-native, only through SJPhone), Motorola, Nokia, Blackberry, Java PDA's, Sony Ericsson, Samsung Freeware SIP, AIM, iChat, XMPP, MSN, Yahoo Yes Online Phone over Edge, UMTS, 3G, Call Land and Cell phone, Voicemail, AOL, iChat, XMPP, Yahoo! Messenger, Windows Live 1.15 (as of May '08)
Jajah Mobile Web Symbian OS, Windows Mobile (version unknown) web based service, Call back,no download[6] Unknown
Amivox Java ME, Android, BlackBerry RIM, iPhone, all mobile browsers Web based / Proprietary SIP, GSM, CDMA, WiMax, WiFi, Facebook Unknown Allows to send voice messages as a micro-call, as SMS, as Email or to post them on to Facebook 2.0
Line2 iOS (iPhone & iPad), Android Freeware / Proprietary Proprietary with SIP core Unknown Tri-mode calling (cellular, 3G/4G data, WiFi), SMS over IP, visual voicemail, 20-person conference calls, auto-attendant, call-forwarding 1.0.4 Android, 3.2.1 iOS
Sipdroid Android GPL SIP Unknown Uses wifi, 3G or EDGE
Truphone Nokia-Symbian, iPhone, Android, Blackberry Freeware / Proprietary SIP Unknown WiFi VoIP out & in, SMS over IP, call-through & call-back, connection management, provisioning 4.0 Symbian, 1.11.1 iPhone
Vopium Symbian, Java ME, Android, BlackBerry RIM, iPhone, Windows Mobile 2003 SE and higher, iPhone (selected models) Freeware / Proprietary SIP, GSM, MSN, Skype, Yahoo, AOL, ICQ, Google Talk, Facebook & Twitter, Unknown WiFi VoIP, GSM call-trough, SMS over IP, least cost routing, Synchronisation/back-up of mobile contacts and calendar 2.0
Windows Mobile 6 Windows Mobile 6 Professional/Standard Proprietary SIP to publicly and non-publicly routable servers Unknown WiFi Mobile VoIP 6.1
X-PRO for Pocket PC Windows Mobile 2003 (earlier versions support Windows PocketPC 2002) Proprietary, discontinued in April 2007[7] SIP Unknown Supported devices: AudioVox Maestro, Compaq/HP iPAQ: 365x, 37xx, 385x, 395x, hx4700, Dell Axim X51, X51v, Toshiba e550, e570. iPAQ 545x and Toshiba e7xx are not supported.[8] 2.2
CSipSimple Android GPL SIP SRTP / ZRTP / SIP over TLS (using special builds) Java based android application

Frameworks and libraries

Program Operating systems License Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release
Tapioca Linux GPL / Free software Telepathy (software) Unknown 0.3.9 (June 12, 2006)
Telepathy/Farsight Linux, Mac OS X, Windows LGPL / Free software SIP, XMPP (Jingle), ICE (STUN/TURN), UPnP None yet Multi-user A/V conferencing, IM, collaborative applications Mobile devices (Maemo), Linux Desktop spec 0.17.8 (24-Jul-2008)

Server software

Program Operating systems License Protocols/based upon/compatible with Encryption Other capabilities Key and target markets Latest release
3CX Phone System Microsoft Windows Closed SIP TLS, SRTP Voice and Video IP telephony, Voice and Video conferencing, voice mail and instant messaging 25,000 - 50,000 users 9 (Jan 2011)
AS5300 Linux, Windows Server 2003 Closed SIP, UNIStim, MLPP SSL, TLS,

SRTP, SDESC

 Voice and Video IP telephony, Voice and Video conferencing, voice mail and instant messaging 1,000 - 25,000 users 1.0 (Jan 2008)
Asterisk PBX Linux/BSD, Mac OS X, Solaris GPL / Free software SIP, H.323, IAX TLS, SRTP VoIP Gateway, voicemail, basic accounting (can be expanded by interface with ODBC-compliant database), billing, conferencing, hot-desking, IVR trees with conditional logic, call queuing, automated call distribution[9] Enthusiasts, developers, enterprise users (capacity dependent on server design, scalable across multiple servers) 1.8.7.0 (September 2011) and version 10.0.0 Beta1
CallMax Softswitch Linux Closed Proprietary SIP, H.323 SSL, TLS, HTTPS Integrated billing, Residential/Hosted IP PBX, Multilevel IVR menu, Calling card platform, Callshop module, DID-numbers, SIP Trunking, Authorization by SIP, PIN, ANI, IP address and login/password SIP Service Providers, VoIP service providers, IP PBX Users, Other Class 5 softswitch users February 2011
Cisco Unified Communications Manager Linux Proprietary SIP, SCCP, MGCP, H.323 SSL, TLS, SRTP SIP Registrar/Proxy, Authentication Enterprise users 8.5
ClearSea (Mirial s.u.r.l.) Windows 2000/XP/2003/Vista/7 (including 64bit versions), Mac OS X (x86) Closed Proprietary SIP, H.323   H.239 presentation,H.224, H.281 (FECC), Acts as a Session Border Controller, H.323/SIP endpoint autodiscovery on local LAN, Support user authentication with external databases / LDAP,Centralized Contacts Directory, User Groups management, Video IVR for dialing endpoint extensions, Ajax-powered web-based administration console, ClearSea desktop client one-step installation via HTTP browser, Automatic provisioning, configuration and secure authentication of ClearSea client based on user credentials Desktop video conferencing users, Enterprises, Educational and Healthcare organizations 1.0.3 (April 30, 2010)
CommuniGate Pro Linux/BSD, Mac OS X, Windows, Solaris, HPUX, AIX Closed Proprietary SIP, XIMSS Protocol, XMPP SSL, TLS, SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, and many others... Mobile Operators, ISP's, and SaaS providers 5.4c1 (January 2011)
Elastix Linux GPL / Free software SIP, IAX, H323, XMPP Unified communication server that also supports chat, mail and fax. Capacity dependent on server design, scalable across multiple servers 2.0.3
FreeSWITCH Linux/BSD, Mac OS X, Solaris, Windows Mozilla Public License / Free software / Open source SIP, NAT-PMP, STUN, SIMPLE, XMPP, Google Talk (Jingle), IAX, H.323, MRCP, RSS, Skype

TLS, SRTP, ZRTP

 Recording, Voicemail, Conferencing, RADIUS, ENUM, IM Proxy, Streaming, Media gateway, Soft-PBX, IVR (modular) Large soft-switch users, home PBX users, softphone users 1.0.6 (April 16, 2010)
GNU Gatekeeper Linux/FreeBSD, Mac OS X, Windows XP/2000/Vista/Windows 7 GPLv2 / Free software H.323 H.235 H.460.18 firewall traversal, Routing, Accounting video conferencing, VoIP carriers large and small 2.3.2, May 25, 2010
MediaCore Softswitch Linux Closed Proprietary H.323, SIP SSL, TLS, HTTPS Dynamic routing mechanism, integrated billing, SIP-H.323 protocol converter, Transcoding - codec converter module, Guardian - revenue assurance module, SBC functionality, full and media proxy Transit VoIP services providers, VoIP wholesale carriers 2.22 (September 2011)
Murmur Linux/BSD, Mac OS X, Windows BSD / GPLv2 CELT / Speex TLS Chat with (limited) embedded HTML, ACLs for user management, Customizable In-Game Overlay, Directional Audio, Plugin Support, Nested Channels Individuals to Small and medium enterprise (25-5000 users) 1.2.3 (February 19, 2011)
Mysipswitch Linux BSD / Free software / Open source SIP, Ajax SSL SIP proxy server which allows the use of multiple SIP accounts with a single SIP login Individuals August 2007
Objectworld UC Server Windows XP/2003/2008 Closed Proprietary SIP IP PBX, personal assistants, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange and Lotus Domino/Notes integration, conferencing, outbound dialing Small and medium enterprise (25-2000 users) 4.4.2 (May 2009)
Kamailio/OpenSIPS (formerly known as OpenSER) Linux/BSD, Solaris GPL / Free software SIP, XMPP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, least-cost-routing and many others. SIP Service Providers 3.0.0 (January 2010)
pbxnsip Linux/BSD, Mac OS X, Windows Closed Proprietary SIP SRTP IP PBX, presence indication, IVR, automated phone provisioning, fax server, unified messaging, Outlook, Exchange integration, conferencing, outbound dialing Small and medium enterprise (25-256 users) 3.3.1.3177 (April 2009)
Revation LinkLive Windows server / Linux Closed Proprietary SIP TLS, SRTP Secure Unified Communications, Presence, Instant Messaging/Chat, VoIP, Video, Desktop Sharing, File Sharing, IVR, PBX, Voicemail, ACD, Email Server SIP Service Providers 5.3 (August 2011)
SIP Express Router (SER) Linux/BSD, Solaris GPL / Free software SIP SIP Registrar/Proxy, Authentication, Diameter, RADIUS, ENUM, and many others... SIP Service Providers 2.0.0 Ottendorf
sipX ECS IP PBX Linux L-GPL / Open source Native SIP Call Control HTTPS, TLS Full redundancy (HA), plug & play management including phones and gateways, fully featured Enterprises between 200 and 10,000 users, multi-site 4.2, April 2010
Unison Linux Closed Proprietary SIP, XMPP, IMAP, SMTP, CalDAV SSL, TLS Unified messaging, IP PBX, IVR, instant messaging, calendar server, LDAP server, E-mail server Small and medium enterprise (25-256 users) 3.0, February 2010
vzRoom Windows Closed Proprietary SIP SSL, TLS, AES Instant Messaging/Chat, VoIP, Video, Desktop Sharing, Video Sharing, whiteboard, File Sharing, scheduler, recording Individual to small and medium enterprise (2-1,000 users) 0.8.8.735, November 2010

See also

References

  1. ^ a b "Skype Connect". Skype.com. Retrieved 2011-07-27.
  2. ^ Eyeball Chat 3.2 Features. EyeballlChat.com.
  3. ^ "Telephony with Lotus Sametime software". IBM.com. Retrieved 2010-02-16
  4. ^ Announcement: QuteCom 2.2.1
  5. ^ "Skype 5.6 for Windows release notes". http://blogs.skype.com/garage/2011/10/skype_56_updated_for_windows_release_notes.html. Retrieved 16 October 2011. 
  6. ^ "JAJAH.Mobile Web". Jajah.com.
  7. ^ "Pocket PC SIP Softphone". Counterpath.com.
  8. ^ "Recommended Pocket PCs". Counterpath.com.
  9. ^ Voip-Info.org, "Asterisk".

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