At FOSDEM 2010 I got an update about latest version from its creator, Emil Ivov, yet again nice surprises. His talk at the event was about Skype-like conference calls and yes, it is something very useful. While being in a conference call via SIP, it is very often I have no idea who is speaking. I have to memorize and map to names the voice stamps in order to make a remark addressing by name to who is speaking.
Latest SIP Communicator brings audio levels indications for each participants -- it is able to host audio conferences, acting as mixer, furthermore nicely letting you know who is speaking and his/her voice volume, thus making easier to distinguish when many people speak at the same time - what skype had for long time. All together make SC a perfect solution for any kind of enterprises or residential users.
Here is a relevant screenshot:
See more screenshots here.
Based on this neat features, we started a joint project with SIP Express Media Server (SEMS) to implement similar audio mixer (in SEMS) and presence agent (in Kamailio) for centralized conferencing system -- all to be coded over summer within GSoC 2010 program.
SC, besides supporting SIP, can be used as client for other protocols such as XMPP/Jabber/GTalk, AIM/ICQ, MSN, Yahoo! Messenger, Bonjour, IRC, RSS.
Regarding SIP and real time communication, among features:
- multiple SIP accounts
- audio and video calling
- instant messaging and presence
- IPv4 and IPv6; UDP, TCP and TLS
- zRTP and OTR encryption for instant messaging chats
- call on hold, call transfer, ...
- multiparty audio conferencing (conference mixer, 3 or more participants), with audio level indication
- STUN, SIP INFO DTMF
- desktop sharing
- file transfer
- internationalization - English, German, French, Japanese, Spanish, Italian, ...
SIP Communicator is a very dynamic project, with many developers, one of the best choices out there if you need extensions. Sure it gets my recommendation for a SIP softphone to be used in daily manner. Read more about on project's site: