====== SIP Clients ======


^ Program      ^ Operating systems                                    ^ License  ^ Protocols                            ^ Codecs                                                                                   ^ Encryption       ^ Other capabilities                                                                                            ^
| [[https://en.wikipedia.org/wiki/Jitsi|Jitsi]]        | Linux, Mac OS, Windows (all java supported)          | LGPL     | SIP/SIMPLE, XMPP/JingleSTUN ICE, TURN  | SILK, G.722, Speex,Opus, G.711 (PCMU/PCMA), iLBC,GSM, G.729, H.264,H.263, VP8             | ZRTP, SRTP, TLS  | Text messaging, audio/video telephony, IPv6 (often broken,[9] P2P not supported[10]), call recording, 64-bit  |
| Linphone     | Linux, Windows, Mac OS, Android, iPhone, BlackBerry  | GPL      | SIP                                  | Speex, G711, GSM,G.722; VP8 (WebM),H263, MPEG4, Theoraand H264 (plugin)                  | TLS, SRTP, ZRTP  | Video, IM, STUN, IPv6 (disables IPv4 support when enabled, P2P supported only by version 3.5.1-2)             |
| MicroSIP     | Windows                                              | GPL      | SIP, STUN,ICE, SIMPLE                | Speex, iLBC, GSM,G.711, G.722, G.729,SILK, Linear PCM                                    | TLS, SRTP        | Video, voice, IM and Presence                                                                                 |
| PhonerLite   | Windows                                              | Free     | SIP                                  | Unknown                                                                                  | TLS, SRTP, ZRTP  | Conferencing, call redirection, call recording                                                                |
| QuteCom      | Linux, Mac OS X,Windows XP/2000                      | GPL      | SIP                                  | G.711, G.729, iLBC,AMR-NB, G.722, Speex,AMR-WB (G.722.2),H.263, H.263+, H.264,Dirac[13]  | SRTP             | Video, IM (MSN, AIM, ICQ, Yahoo!, XMPP, Google Talk), voicemail, wengo to phone, conferencing.                |
| Yate Client  | Linux, Mac OS, Windows                               | GPL      | SIP, IAX,XMPP, H.323                 | G.711a, G.711u, GSM 06.10, iLBC, Speex,G.723, G.726, G.728,G.729                         | Unknown          |                                                                                                               


http://en.wikipedia.org/wiki/Comparison_of_VoIP_software

http://habrahabr.ru/company/onlinepbx/blog/171139/

[[http://www.3cx.com/ip-pbx/|3CX Phone]]\\
[[http://www.microsip.org/downloads|MicroSip]]\\
[[http://phonerlite.de/download_en.htm|PhonerLite]]\\
[[http://www.qutecom.org/|QuteCom]]\\

[[http://www.skype.com/go/getskype-msi|Skype]]\\
[[http://www.viber.com/|Viber]]